21957368285143 has 2 divisors, whose sum is σ = 21957368285144. Its totient is φ = 21957368285142.

The previous prime is 21957368285137. The next prime is 21957368285213. The reversal of 21957368285143 is 34158286375912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21957368285143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21957368285243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10978684142571 + 10978684142572.

It is an arithmetic number, because the mean of its divisors is an integer number (10978684142572).

Almost surely, 2^{21957368285143} is an apocalyptic number.

21957368285143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21957368285143 is an equidigital number, since it uses as much as digits as its factorization.

21957368285143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87091200, while the sum is 64.

The spelling of 21957368285143 in words is "twenty-one trillion, nine hundred fifty-seven billion, three hundred sixty-eight million, two hundred eighty-five thousand, one hundred forty-three".