15121221402402 has 64 divisors (see below), whose sum is σ = 35758135584000. Its totient is φ = 4720073783040.

The previous prime is 15121221402373. The next prime is 15121221402431. The reversal of 15121221402402 is 20420412212151.

15121221402402 is a `hidden beast` number, since 1 + 5 + 1 + 212 + 2 + 1 + 40 + 2 + 402 = 666.

It is an interprime number because it is at equal distance from previous prime (15121221402373) and next prime (15121221402431).

It is a super-2 number, since 2×15121221402402² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41204049 + ... + 41569412.

It is an arithmetic number, because the mean of its divisors is an integer number (558720868500).

Almost surely, 2^{15121221402402} is an apocalyptic number.

15121221402402 is an abundant number, since it is smaller than the sum of its proper divisors (20636914181598).

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

15121221402402 is a wasteful number, since it uses less digits than its factorization.

15121221402402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82773688 (or 82773682 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

Adding to 15121221402402 its reverse (20420412212151), we get a palindrome (35541633614553).

The spelling of 15121221402402 in words is "fifteen trillion, one hundred twenty-one billion, two hundred twenty-one million, four hundred two thousand, four hundred two".