21302231131 has 4 divisors (see below), whose sum is σ = 21304369872. Its totient is φ = 21300092392.

The previous prime is 21302231101. The next prime is 21302231147. The reversal of 21302231131 is 13113220312.

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 21302231131 - 2²³ = 21293842523 is a prime.

It is a super-2 number, since 2×21302231131² (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 = 21302231099 and 21302231108.

It is not an unprimeable number, because it can be changed into a prime (21302231101) 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, 1054360 + ... + 1074373.

It is an arithmetic number, because the mean of its divisors is an integer number (5326092468).

Almost surely, 2^21302231131 is an apocalyptic number.

21302231131 is a deficient number, since it is larger than the sum of its proper divisors (2138741).

21302231131 is a wasteful number, since it uses less digits than its factorization.

21302231131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138740.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21302231131 its reverse (13113220312), we get a palindrome (34415451443).

The spelling of 21302231131 in words is "twenty-one billion, three hundred two million, two hundred thirty-one thousand, one hundred thirty-one".