21202113021 has 16 divisors (see below), whose sum is σ = 28805388480. Its totient is φ = 13869215360.

The previous prime is 21202113001. The next prime is 21202113029. The reversal of 21202113021 is 12031120212.

It is a cyclic number.

It is not a de Polignac number, because 21202113021 - 2¹⁸ = 21201850877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202113029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268110 + ... + 338063.

It is an arithmetic number, because the mean of its divisors is an integer number (1800336780).

Almost surely, 2^21202113021 is an apocalyptic number.

It is an amenable number.

21202113021 is a deficient number, since it is larger than the sum of its proper divisors (7603275459).

21202113021 is a wasteful number, since it uses less digits than its factorization.

21202113021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606396.

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

Adding to 21202113021 its reverse (12031120212), we get a palindrome (33233233233).

The spelling of 21202113021 in words is "twenty-one billion, two hundred two million, one hundred thirteen thousand, twenty-one".