15551042120 has 32 divisors (see below), whose sum is σ = 36118552320. Its totient is φ = 6019757760.

The previous prime is 15551042113. The next prime is 15551042123. The reversal of 15551042120 is 2124015551.

It is a super-2 number, since 2×15551042120² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15551042120.

It is not an unprimeable number, because it can be changed into a prime (15551042123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6269342 + ... + 6271821.

It is an arithmetic number, because the mean of its divisors is an integer number (1128704760).

Almost surely, 2^15551042120 is an apocalyptic number.

15551042120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15551042120 is an abundant number, since it is smaller than the sum of its proper divisors (20567510200).

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

15551042120 is a wasteful number, since it uses less digits than its factorization.

15551042120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12541205 (or 12541201 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 15551042120 its reverse (2124015551), we get a palindrome (17675057671).

The spelling of 15551042120 in words is "fifteen billion, five hundred fifty-one million, forty-two thousand, one hundred twenty".