21027043624 has 64 divisors (see below), whose sum is σ = 42343741440. Its totient is φ = 9766384320.

The previous prime is 21027043621. The next prime is 21027043627. The reversal of 21027043624 is 42634072012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21027043621) and next prime (21027043627).

It is not an unprimeable number, because it can be changed into a prime (21027043621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 863277 + ... + 887299.

It is an arithmetic number, because the mean of its divisors is an integer number (661620960).

Almost surely, 2^21027043624 is an apocalyptic number.

It is an amenable number.

21027043624 is an abundant number, since it is smaller than the sum of its proper divisors (21316697816).

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

21027043624 is a wasteful number, since it uses less digits than its factorization.

21027043624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24190 (or 24186 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The spelling of 21027043624 in words is "twenty-one billion, twenty-seven million, forty-three thousand, six hundred twenty-four".