2251105621 has 2 divisors, whose sum is σ = 2251105622. Its totient is φ = 2251105620.

The previous prime is 2251105603. The next prime is 2251105639. The reversal of 2251105621 is 1265011522.

It is a balanced prime because it is at equal distance from previous prime (2251105603) and next prime (2251105639).

It can be written as a sum of positive squares in only one way, i.e., 1915812900 + 335292721 = 43770^2 + 18311^2 .

It is a cyclic number.

It is not a de Polignac number, because 2251105621 - 2²³ = 2242717013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2251105121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1125552810 + 1125552811.

It is an arithmetic number, because the mean of its divisors is an integer number (1125552811).

Almost surely, 2^2251105621 is an apocalyptic number.

It is an amenable number.

2251105621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2251105621 is an equidigital number, since it uses as much as digits as its factorization.

2251105621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 2251105621 is about 47445.8177398177. The cubic root of 2251105621 is about 1310.5852950485.

The spelling of 2251105621 in words is "two billion, two hundred fifty-one million, one hundred five thousand, six hundred twenty-one".