221021100020113 has 4 divisors (see below), whose sum is σ = 222344579661120. Its totient is φ = 219697620379108.

The previous prime is 221021100020087. The next prime is 221021100020143. The reversal of 221021100020113 is 311020001120122.

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 221021100020113 - 2²⁵ = 221021066465681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021100020143) 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, 661739820253 + ... + 661739820586.

It is an arithmetic number, because the mean of its divisors is an integer number (55586144915280).

Almost surely, 2^{221021100020113} is an apocalyptic number.

It is an amenable number.

221021100020113 is a deficient number, since it is larger than the sum of its proper divisors (1323479641007).

221021100020113 is a wasteful number, since it uses less digits than its factorization.

221021100020113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323479641006.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 221021100020113 its reverse (311020001120122), we get a palindrome (532041101140235).

The spelling of 221021100020113 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred million, twenty thousand, one hundred thirteen".