121221330 has 32 divisors (see below), whose sum is σ = 306244800. Its totient is φ = 30624192.

The previous prime is 121221283. The next prime is 121221337. The reversal of 121221330 is 33122121.

It is a super-2 number, since 2×121221330² = 29389221693937800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (121221337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105765 + ... + 106904.

It is an arithmetic number, because the mean of its divisors is an integer number (9570150).

Almost surely, 2^121221330 is an apocalyptic number.

121221330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221330 is an abundant number, since it is smaller than the sum of its proper divisors (185023470).

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

121221330 is a wasteful number, since it uses less digits than its factorization.

121221330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212698.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 121221330 is about 11010.0558581689. The cubic root of 121221330 is about 494.9101357120.

Adding to 121221330 its reverse (33122121), we get a palindrome (154343451).

The spelling of 121221330 in words is "one hundred twenty-one million, two hundred twenty-one thousand, three hundred thirty".