21222032131 has 4 divisors (see below), whose sum is σ = 21520934064. Its totient is φ = 20923130200.

The previous prime is 21222032087. The next prime is 21222032147. The reversal of 21222032131 is 13123022212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21222032131 - 2¹⁵ = 21221999363 is a prime.

It is a super-2 number, since 2×21222032131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222032099 and 21222032108.

It is not an unprimeable number, because it can be changed into a prime (21222032191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149450860 + ... + 149451001.

It is an arithmetic number, because the mean of its divisors is an integer number (5380233516).

Almost surely, 2^21222032131 is an apocalyptic number.

21222032131 is a deficient number, since it is larger than the sum of its proper divisors (298901933).

21222032131 is an equidigital number, since it uses as much as digits as its factorization.

21222032131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298901932.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21222032131 its reverse (13123022212), we get a palindrome (34345054343).

The spelling of 21222032131 in words is "twenty-one billion, two hundred twenty-two million, thirty-two thousand, one hundred thirty-one".