21516261512 has 16 divisors (see below), whose sum is σ = 41644377600. Its totient is φ = 10411094160.

The previous prime is 21516261509. The next prime is 21516261521.

21516261512 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21516261512² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43379312 + ... + 43379807.

It is an arithmetic number, because the mean of its divisors is an integer number (2602773600).

Almost surely, 2^21516261512 is an apocalyptic number.

It is an amenable number.

21516261512 is a deficient number, since it is larger than the sum of its proper divisors (20128116088).

21516261512 is a wasteful number, since it uses less digits than its factorization.

21516261512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86759156 (or 86759152 counting only the distinct ones).

The product of its digits is 7200, while the sum is 32.

The spelling of 21516261512 in words is "twenty-one billion, five hundred sixteen million, two hundred sixty-one thousand, five hundred twelve".