20321013131 has 4 divisors (see below), whose sum is σ = 20469341832. Its totient is φ = 20172684432.

The previous prime is 20321013077. The next prime is 20321013137. The reversal of 20321013131 is 13131012302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321013131 is a prime.

It is a super-2 number, since 2×20321013131² (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 (20321013137) 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, 74164145 + ... + 74164418.

It is an arithmetic number, because the mean of its divisors is an integer number (5117335458).

Almost surely, 2^20321013131 is an apocalyptic number.

20321013131 is a deficient number, since it is larger than the sum of its proper divisors (148328701).

20321013131 is a wasteful number, since it uses less digits than its factorization.

20321013131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148328700.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20321013131 its reverse (13131012302), we get a palindrome (33452025433).

The spelling of 20321013131 in words is "twenty billion, three hundred twenty-one million, thirteen thousand, one hundred thirty-one".