21012030113 has 4 divisors (see below), whose sum is σ = 21689837568. Its totient is φ = 20334222660.

The previous prime is 21012030037. The next prime is 21012030119. The reversal of 21012030113 is 31103021012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21012030113 - 2¹⁰ = 21012029089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012030119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338903681 + ... + 338903742.

It is an arithmetic number, because the mean of its divisors is an integer number (5422459392).

Almost surely, 2^21012030113 is an apocalyptic number.

It is an amenable number.

21012030113 is a deficient number, since it is larger than the sum of its proper divisors (677807455).

21012030113 is an equidigital number, since it uses as much as digits as its factorization.

21012030113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677807454.

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

Adding to 21012030113 its reverse (31103021012), we get a palindrome (52115051125).

The spelling of 21012030113 in words is "twenty-one billion, twelve million, thirty thousand, one hundred thirteen".