20951972143 has 2 divisors, whose sum is σ = 20951972144. Its totient is φ = 20951972142.

The previous prime is 20951972057. The next prime is 20951972159. The reversal of 20951972143 is 34127915902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20951972143 - 2²⁵ = 20918417711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20951972143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20951912143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10475986071 + 10475986072.

It is an arithmetic number, because the mean of its divisors is an integer number (10475986072).

Almost surely, 2^20951972143 is an apocalyptic number.

20951972143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20951972143 is an equidigital number, since it uses as much as digits as its factorization.

20951972143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 20951972143 in words is "twenty billion, nine hundred fifty-one million, nine hundred seventy-two thousand, one hundred forty-three".