15521055020 has 24 divisors (see below), whose sum is σ = 32599249200. Its totient is φ = 6207463232.

The previous prime is 15521055019. The next prime is 15521055031. The reversal of 15521055020 is 2055012551.

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 7 ways as a sum of consecutive naturals, for example, 80891 + ... + 193869.

It is an arithmetic number, because the mean of its divisors is an integer number (1358302050).

Almost surely, 2^15521055020 is an apocalyptic number.

15521055020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15521055020 is an abundant number, since it is smaller than the sum of its proper divisors (17078194180).

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

15521055020 is a wasteful number, since it uses less digits than its factorization.

15521055020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119857 (or 119855 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 26.

Adding to 15521055020 its reverse (2055012551), we get a palindrome (17576067571).

The spelling of 15521055020 in words is "fifteen billion, five hundred twenty-one million, fifty-five thousand, twenty".