21010524021 has 6 divisors (see below), whose sum is σ = 30348534710. Its totient is φ = 14007016008.

The previous prime is 21010523999. The next prime is 21010524089. The reversal of 21010524021 is 12042501012.

21010524021 is a `hidden beast` number, since 210 + 1 + 0 + 52 + 402 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10706040900 + 10304483121 = 103470^2 + 101511^2 .

It is not a de Polignac number, because 21010524021 - 2⁹ = 21010523509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010523985 and 21010524003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010124021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1167251326 + ... + 1167251343.

Almost surely, 2^21010524021 is an apocalyptic number.

It is an amenable number.

21010524021 is a deficient number, since it is larger than the sum of its proper divisors (9338010689).

21010524021 is a wasteful number, since it uses less digits than its factorization.

21010524021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334502675 (or 2334502672 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The spelling of 21010524021 in words is "twenty-one billion, ten million, five hundred twenty-four thousand, twenty-one".