21021232113113 has 4 divisors (see below), whose sum is σ = 21050468876160. Its totient is φ = 20991995350068.

The previous prime is 21021232113107. The next prime is 21021232113137. The reversal of 21021232113113 is 31131123212012.

It is a happy number.

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 21021232113113 - 2⁴⁴ = 3429046068697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021232133113) 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, 14618380445 + ... + 14618381882.

It is an arithmetic number, because the mean of its divisors is an integer number (5262617219040).

Almost surely, 2^{21021232113113} is an apocalyptic number.

It is an amenable number.

21021232113113 is a deficient number, since it is larger than the sum of its proper divisors (29236763047).

21021232113113 is an equidigital number, since it uses as much as digits as its factorization.

21021232113113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29236763046.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21021232113113 its reverse (31131123212012), we get a palindrome (52152355325125).

The spelling of 21021232113113 in words is "twenty-one trillion, twenty-one billion, two hundred thirty-two million, one hundred thirteen thousand, one hundred thirteen".