21027063213 has 40 divisors (see below), whose sum is σ = 34234710048. Its totient is φ = 12783777696.

The previous prime is 21027063157. The next prime is 21027063247. The reversal of 21027063213 is 31236072012.

21027063213 is a `hidden beast` number, since 2 + 1 + 0 + 27 + 0 + 632 + 1 + 3 = 666.

It is not a de Polignac number, because 21027063213 - 2¹² = 21027059117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21027063413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 32895 + ... + 207692.

Almost surely, 2^21027063213 is an apocalyptic number.

It is an amenable number.

21027063213 is a deficient number, since it is larger than the sum of its proper divisors (13207646835).

21027063213 is a wasteful number, since it uses less digits than its factorization.

21027063213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240695 (or 240686 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The spelling of 21027063213 in words is "twenty-one billion, twenty-seven million, sixty-three thousand, two hundred thirteen".