21021030113 has 24 divisors (see below), whose sum is σ = 22789935168. Its totient is φ = 19371841632.

The previous prime is 21021030089. The next prime is 21021030119. The reversal of 21021030113 is 31103012012.

It is not a de Polignac number, because 21021030113 - 2¹⁸ = 21020767969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021030119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2010806 + ... + 2021232.

It is an arithmetic number, because the mean of its divisors is an integer number (949580632).

Almost surely, 2^21021030113 is an apocalyptic number.

21021030113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21021030113 is a deficient number, since it is larger than the sum of its proper divisors (1768905055).

21021030113 is a wasteful number, since it uses less digits than its factorization.

21021030113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10613 (or 10590 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21021030113 its reverse (31103012012), we get a palindrome (52124042125).

The spelling of 21021030113 in words is "twenty-one billion, twenty-one million, thirty thousand, one hundred thirteen".