10621040561 has 2 divisors, whose sum is σ = 10621040562. Its totient is φ = 10621040560.

The previous prime is 10621040557. The next prime is 10621040593. The reversal of 10621040561 is 16504012601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7368505600 + 3252534961 = 85840^2 + 57031^2 .

It is a cyclic number.

It is not a de Polignac number, because 10621040561 - 2² = 10621040557 is a prime.

It is a super-2 number, since 2×10621040561² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10621040561.

It is not a weakly prime, because it can be changed into another prime (10621048561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310520280 + 5310520281.

It is an arithmetic number, because the mean of its divisors is an integer number (5310520281).

Almost surely, 2^10621040561 is an apocalyptic number.

It is an amenable number.

10621040561 is a deficient number, since it is larger than the sum of its proper divisors (1).

10621040561 is an equidigital number, since it uses as much as digits as its factorization.

10621040561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 10621040561 in words is "ten billion, six hundred twenty-one million, forty thousand, five hundred sixty-one".