21515266086 has 32 divisors (see below), whose sum is σ = 44204640000. Its totient is φ = 6976168416.

The previous prime is 21515266021. The next prime is 21515266109. The reversal of 21515266086 is 68066251512.

It is a congruent number.

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, 1100085 + ... + 1119471.

It is an arithmetic number, because the mean of its divisors is an integer number (1381395000).

Almost surely, 2^21515266086 is an apocalyptic number.

21515266086 is an abundant number, since it is smaller than the sum of its proper divisors (22689373914).

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

21515266086 is a wasteful number, since it uses less digits than its factorization.

21515266086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24428.

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 21515266086 in words is "twenty-one billion, five hundred fifteen million, two hundred sixty-six thousand, eighty-six".