21355466400731 has 2 divisors, whose sum is σ = 21355466400732. Its totient is φ = 21355466400730.

The previous prime is 21355466400707. The next prime is 21355466400757. The reversal of 21355466400731 is 13700466455312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21355466400731 is a prime.

It is a super-2 number, since 2×21355466400731² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21355466400781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677733200365 + 10677733200366.

It is an arithmetic number, because the mean of its divisors is an integer number (10677733200366).

Almost surely, 2^{21355466400731} is an apocalyptic number.

21355466400731 is a deficient number, since it is larger than the sum of its proper divisors (1).

21355466400731 is an equidigital number, since it uses as much as digits as its factorization.

21355466400731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 21355466400731 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred sixty-six million, four hundred thousand, seven hundred thirty-one".