10550555621 has 2 divisors, whose sum is σ = 10550555622. Its totient is φ = 10550555620.

The previous prime is 10550555573. The next prime is 10550555633. The reversal of 10550555621 is 12655505501.

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., 5832376900 + 4718178721 = 76370^2 + 68689^2 .

It is a cyclic number.

It is not a de Polignac number, because 10550555621 - 2⁶ = 10550555557 is a prime.

It is a super-2 number, since 2×10550555621² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10550555651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275277810 + 5275277811.

It is an arithmetic number, because the mean of its divisors is an integer number (5275277811).

Almost surely, 2^10550555621 is an apocalyptic number.

It is an amenable number.

10550555621 is a deficient number, since it is larger than the sum of its proper divisors (1).

10550555621 is an equidigital number, since it uses as much as digits as its factorization.

10550555621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37500, while the sum is 35.

The spelling of 10550555621 in words is "ten billion, five hundred fifty million, five hundred fifty-five thousand, six hundred twenty-one".