121530402 has 32 divisors (see below), whose sum is σ = 308649600. Its totient is φ = 34722864.

The previous prime is 121530397. The next prime is 121530419. The reversal of 121530402 is 204035121.

It is a super-2 number, since 2×121530402² = 29539277220563208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160377 + ... + 161132.

It is an arithmetic number, because the mean of its divisors is an integer number (9645300).

Almost surely, 2^121530402 is an apocalyptic number.

121530402 is an abundant number, since it is smaller than the sum of its proper divisors (187119198).

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

121530402 is a wasteful number, since it uses less digits than its factorization.

121530402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321527 (or 321521 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 121530402 is about 11024.0828189922. The cubic root of 121530402 is about 495.3303946677.

Adding to 121530402 its reverse (204035121), we get a palindrome (325565523).

The spelling of 121530402 in words is "one hundred twenty-one million, five hundred thirty thousand, four hundred two".