51443622634421 has 2 divisors, whose sum is σ = 51443622634422. Its totient is φ = 51443622634420.

The previous prime is 51443622634387. The next prime is 51443622634429. The reversal of 51443622634421 is 12443622634415.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35643108934225 + 15800513700196 = 5970185^2 + 3974986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51443622634421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51443622634429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25721811317210 + 25721811317211.

It is an arithmetic number, because the mean of its divisors is an integer number (25721811317211).

Almost surely, 2^{51443622634421} is an apocalyptic number.

It is an amenable number.

51443622634421 is a deficient number, since it is larger than the sum of its proper divisors (1).

51443622634421 is an equidigital number, since it uses as much as digits as its factorization.

51443622634421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 47.

The spelling of 51443622634421 in words is "fifty-one trillion, four hundred forty-three billion, six hundred twenty-two million, six hundred thirty-four thousand, four hundred twenty-one".