21415421862431 has 2 divisors, whose sum is σ = 21415421862432. Its totient is φ = 21415421862430.

The previous prime is 21415421862397. The next prime is 21415421862503. The reversal of 21415421862431 is 13426812451412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21415421862431 is a prime.

It is a super-2 number, since 2×21415421862431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21415421462431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707710931215 + 10707710931216.

It is an arithmetic number, because the mean of its divisors is an integer number (10707710931216).

Almost surely, 2^{21415421862431} is an apocalyptic number.

21415421862431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21415421862431 is an equidigital number, since it uses as much as digits as its factorization.

21415421862431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 368640, while the sum is 44.

The spelling of 21415421862431 in words is "twenty-one trillion, four hundred fifteen billion, four hundred twenty-one million, eight hundred sixty-two thousand, four hundred thirty-one".