21202111229 has 16 divisors (see below), whose sum is σ = 25079779200. Its totient is φ = 17734977216.

The previous prime is 21202111171. The next prime is 21202111253. The reversal of 21202111229 is 92211120212.

It is a cyclic number.

It is not a de Polignac number, because 21202111229 - 2²⁸ = 20933675773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202111279) 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, 1860374 + ... + 1871735.

It is an arithmetic number, because the mean of its divisors is an integer number (1567486200).

Almost surely, 2^21202111229 is an apocalyptic number.

It is an amenable number.

21202111229 is a deficient number, since it is larger than the sum of its proper divisors (3877667971).

21202111229 is a wasteful number, since it uses less digits than its factorization.

21202111229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3732164.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21202111229 in words is "twenty-one billion, two hundred two million, one hundred eleven thousand, two hundred twenty-nine".