21000013024 has 12 divisors (see below), whose sum is σ = 41343775704. Its totient is φ = 10500006496.

The previous prime is 21000013009. The next prime is 21000013039. The reversal of 21000013024 is 42031000012.

It is an interprime number because it is at equal distance from previous prime (21000013009) and next prime (21000013039).

It is a junction number, because it is equal to n+sod(n) for n = 21000012995 and 21000013013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328125172 + ... + 328125235.

It is an arithmetic number, because the mean of its divisors is an integer number (3445314642).

Almost surely, 2^21000013024 is an apocalyptic number.

It is an amenable number.

21000013024 is a deficient number, since it is larger than the sum of its proper divisors (20343762680).

21000013024 is an equidigital number, since it uses as much as digits as its factorization.

21000013024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656250417 (or 656250409 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21000013024 its reverse (42031000012), we get a palindrome (63031013036).

The spelling of 21000013024 in words is "twenty-one billion, thirteen thousand, twenty-four".