21010527999981 has 64 divisors (see below), whose sum is σ = 33551319110400. Its totient is φ = 12917894556672.

The previous prime is 21010527999973. The next prime is 21010527999991. The reversal of 21010527999981 is 18999972501012.

21010527999981 is a `hidden beast` number, since 2 + 1 + 0 + 10 + 527 + 9 + 9 + 9 + 98 + 1 = 666.

It is not a de Polignac number, because 21010527999981 - 2³ = 21010527999973 is a prime.

It is a super-2 number, since 2×21010527999981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010527999961) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2227338441 + ... + 2227347873.

It is an arithmetic number, because the mean of its divisors is an integer number (524239361100).

Almost surely, 2^{21010527999981} is an apocalyptic number.

It is an amenable number.

21010527999981 is a deficient number, since it is larger than the sum of its proper divisors (12540791110419).

21010527999981 is a wasteful number, since it uses less digits than its factorization.

21010527999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14507 (or 14501 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 63.

The spelling of 21010527999981 in words is "twenty-one trillion, ten billion, five hundred twenty-seven million, nine hundred ninety-nine thousand, nine hundred eighty-one".