20013251971 has 2 divisors, whose sum is σ = 20013251972. Its totient is φ = 20013251970.

The previous prime is 20013251953. The next prime is 20013252041. The reversal of 20013251971 is 17915231002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20013251971 - 2²⁵ = 19979697539 is a prime.

It is not a weakly prime, because it can be changed into another prime (20013251941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006625985 + 10006625986.

It is an arithmetic number, because the mean of its divisors is an integer number (10006625986).

Almost surely, 2^20013251971 is an apocalyptic number.

20013251971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013251971 is an equidigital number, since it uses as much as digits as its factorization.

20013251971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

Adding to 20013251971 its reverse (17915231002), we get a palindrome (37928482973).

The spelling of 20013251971 in words is "twenty billion, thirteen million, two hundred fifty-one thousand, nine hundred seventy-one".