21374527663429 has 2 divisors, whose sum is σ = 21374527663430. Its totient is φ = 21374527663428.

The previous prime is 21374527663417. The next prime is 21374527663549. The reversal of 21374527663429 is 92436672547312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16659866722500 + 4714660940929 = 4081650^2 + 2171327^2 .

It is a cyclic number.

It is not a de Polignac number, because 21374527663429 - 2²⁵ = 21374494108997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21374527663729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687263831714 + 10687263831715.

It is an arithmetic number, because the mean of its divisors is an integer number (10687263831715).

Almost surely, 2^{21374527663429} is an apocalyptic number.

It is an amenable number.

21374527663429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374527663429 is an equidigital number, since it uses as much as digits as its factorization.

21374527663429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760, while the sum is 61.

The spelling of 21374527663429 in words is "twenty-one trillion, three hundred seventy-four billion, five hundred twenty-seven million, six hundred sixty-three thousand, four hundred twenty-nine".