121220010 has 128 divisors (see below), whose sum is σ = 338722560. Its totient is φ = 30820608.

The previous prime is 121219999. The next prime is 121220017. The reversal of 121220010 is 10022121.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 121219974 and 121220001.

It is not an unprimeable number, because it can be changed into a prime (121220017) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 615232 + ... + 615428.

It is an arithmetic number, because the mean of its divisors is an integer number (2646270).

Almost surely, 2^121220010 is an apocalyptic number.

121220010 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 121220010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169361280).

121220010 is an abundant number, since it is smaller than the sum of its proper divisors (217502550).

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

121220010 is a wasteful number, since it uses less digits than its factorization.

121220010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 121220010 is about 11009.9959128058. The cubic root of 121220010 is about 494.9083393181.

Adding to 121220010 its reverse (10022121), we get a palindrome (131242131).

The spelling of 121220010 in words is "one hundred twenty-one million, two hundred twenty thousand, ten".