121221030 has 64 divisors (see below), whose sum is σ = 337978368. Its totient is φ = 27250560.

The previous prime is 121221029. The next prime is 121221031. The reversal of 121221030 is 30122121.

It is an interprime number because it is at equal distance from previous prime (121221029) and next prime (121221031).

It is a super-2 number, since 2×121221030² = 29389076228521800, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 121220997 and 121221015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8079 + ... + 17541.

It is an arithmetic number, because the mean of its divisors is an integer number (5280912).

Almost surely, 2^121221030 is an apocalyptic number.

121221030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121221030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168989184).

121221030 is an abundant number, since it is smaller than the sum of its proper divisors (216757338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121221030 is a wasteful number, since it uses less digits than its factorization.

121221030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9541.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 121221030 is about 11010.0422342514. The cubic root of 121221030 is about 494.9097274418.

Adding to 121221030 its reverse (30122121), we get a palindrome (151343151).

The spelling of 121221030 in words is "one hundred twenty-one million, two hundred twenty-one thousand, thirty".