21022002131 has 16 divisors (see below), whose sum is σ = 23434629120. Its totient is φ = 18726521760.

The previous prime is 21022002109. The next prime is 21022002143. The reversal of 21022002131 is 13120022012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21022002131 - 2²² = 21017807827 is a prime.

It is a super-2 number, since 2×21022002131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022002181) 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, 72026 + ... + 217328.

It is an arithmetic number, because the mean of its divisors is an integer number (1464664320).

Almost surely, 2^21022002131 is an apocalyptic number.

21022002131 is a deficient number, since it is larger than the sum of its proper divisors (2412626989).

21022002131 is a wasteful number, since it uses less digits than its factorization.

21022002131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145706.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21022002131 its reverse (13120022012), we get a palindrome (34142024143).

The spelling of 21022002131 in words is "twenty-one billion, twenty-two million, two thousand, one hundred thirty-one".