21202102113 has 4 divisors (see below), whose sum is σ = 28269469488. Its totient is φ = 14134734740.

The previous prime is 21202102111. The next prime is 21202102153. The reversal of 21202102113 is 31120120212.

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 21202102113 - 2¹ = 21202102111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202102092 and 21202102101.

It is not an unprimeable number, because it can be changed into a prime (21202102111) 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, 3533683683 + ... + 3533683688.

It is an arithmetic number, because the mean of its divisors is an integer number (7067367372).

Almost surely, 2^21202102113 is an apocalyptic number.

It is an amenable number.

21202102113 is a deficient number, since it is larger than the sum of its proper divisors (7067367375).

21202102113 is an equidigital number, since it uses as much as digits as its factorization.

21202102113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7067367374.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21202102113 its reverse (31120120212), we get a palindrome (52322222325).

The spelling of 21202102113 in words is "twenty-one billion, two hundred two million, one hundred two thousand, one hundred thirteen".