2251334105621 has 2 divisors, whose sum is σ = 2251334105622. Its totient is φ = 2251334105620.

The previous prime is 2251334105569. The next prime is 2251334105633. The reversal of 2251334105621 is 1265014331522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1689898601521 + 561435504100 = 1299961^2 + 749290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2251334105621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2251334105681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1125667052810 + 1125667052811.

It is an arithmetic number, because the mean of its divisors is an integer number (1125667052811).

Almost surely, 2^{2251334105621} is an apocalyptic number.

It is an amenable number.

2251334105621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2251334105621 is an equidigital number, since it uses as much as digits as its factorization.

2251334105621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 2251334105621 in words is "two trillion, two hundred fifty-one billion, three hundred thirty-four million, one hundred five thousand, six hundred twenty-one".