21002202111 has 32 divisors (see below), whose sum is σ = 31049568000. Its totient is φ = 12521358080.

The previous prime is 21002202103. The next prime is 21002202113. The reversal of 21002202111 is 11120220012.

It is not a de Polignac number, because 21002202111 - 2³ = 21002202103 is a prime.

It is a super-2 number, since 2×21002202111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002202113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 560440 + ... + 596738.

It is an arithmetic number, because the mean of its divisors is an integer number (970299000).

Almost surely, 2^21002202111 is an apocalyptic number.

21002202111 is a deficient number, since it is larger than the sum of its proper divisors (10047365889).

21002202111 is a wasteful number, since it uses less digits than its factorization.

21002202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36599.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21002202111 its reverse (11120220012), we get a palindrome (32122422123).

The spelling of 21002202111 in words is "twenty-one billion, two million, two hundred two thousand, one hundred eleven".