21202112131 has 8 divisors (see below), whose sum is σ = 22131964800. Its totient is φ = 20287629120.

The previous prime is 21202112101. The next prime is 21202112153. The reversal of 21202112131 is 13121120212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202112131 is a prime.

It is a super-2 number, since 2×21202112131² (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 (21202112101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3839596 + ... + 3845113.

It is an arithmetic number, because the mean of its divisors is an integer number (2766495600).

Almost surely, 2^21202112131 is an apocalyptic number.

21202112131 is a deficient number, since it is larger than the sum of its proper divisors (929852669).

21202112131 is an equidigital number, since it uses as much as digits as its factorization.

21202112131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7684829.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21202112131 its reverse (13121120212), we get a palindrome (34323232343).

The spelling of 21202112131 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, one hundred thirty-one".