10621709887 has 4 divisors (see below), whose sum is σ = 10868726440. Its totient is φ = 10374693336.

The previous prime is 10621709867. The next prime is 10621709941. The reversal of 10621709887 is 78890712601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78890712601 = 17 ⋅4640630153.

It is a cyclic number.

It is not a de Polignac number, because 10621709887 - 2⁷ = 10621709759 is a prime.

It is a super-2 number, since 2×10621709887² (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 10621709887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10621709867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123508212 + ... + 123508297.

It is an arithmetic number, because the mean of its divisors is an integer number (2717181610).

Almost surely, 2^10621709887 is an apocalyptic number.

10621709887 is a deficient number, since it is larger than the sum of its proper divisors (247016553).

10621709887 is an equidigital number, since it uses as much as digits as its factorization.

10621709887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247016552.

The product of its (nonzero) digits is 338688, while the sum is 49.

The spelling of 10621709887 in words is "ten billion, six hundred twenty-one million, seven hundred nine thousand, eight hundred eighty-seven".