21001111202 has 16 divisors (see below), whose sum is σ = 31642349112. Its totient is φ = 10453708800.

The previous prime is 21001111189. The next prime is 21001111247. The reversal of 21001111202 is 20211110012.

It can be written as a sum of positive squares in 4 ways, for example, as 15240149401 + 5760961801 = 123451^2 + 75901^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 966368 + ... + 987860.

Almost surely, 2^21001111202 is an apocalyptic number.

21001111202 is a deficient number, since it is larger than the sum of its proper divisors (10641237910).

21001111202 is a wasteful number, since it uses less digits than its factorization.

21001111202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23653.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21001111202 its reverse (20211110012), we get a palindrome (41212221214).

The spelling of 21001111202 in words is "twenty-one billion, one million, one hundred eleven thousand, two hundred two".