10521621189 has 24 divisors (see below), whose sum is σ = 15329000544. Its totient is φ = 6954012000.

The previous prime is 10521621169. The next prime is 10521621191. The reversal of 10521621189 is 98112612501.

10521621189 is a `hidden beast` number, since 1 + 0 + 5 + 21 + 621 + 1 + 8 + 9 = 666.

It is not a de Polignac number, because 10521621189 - 2²⁰ = 10520572613 is a prime.

It is a super-2 number, since 2×10521621189² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10521621119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1376799 + ... + 1384419.

It is an arithmetic number, because the mean of its divisors is an integer number (638708356).

Almost surely, 2^10521621189 is an apocalyptic number.

It is an amenable number.

10521621189 is a deficient number, since it is larger than the sum of its proper divisors (4807379355).

10521621189 is a wasteful number, since it uses less digits than its factorization.

10521621189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8929 (or 8926 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 36.

The spelling of 10521621189 in words is "ten billion, five hundred twenty-one million, six hundred twenty-one thousand, one hundred eighty-nine".