10521990 has 24 divisors (see below), whose sum is σ = 27357408. Its totient is φ = 2805840.

The previous prime is 10521947. The next prime is 10522007. The reversal of 10521990 is 9912501.

It is a happy number.

It is a super-2 number, since 2×10521990² = 221424547120200, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58366 + ... + 58545.

It is an arithmetic number, because the mean of its divisors is an integer number (1139892).

Almost surely, 2^10521990 is an apocalyptic number.

10521990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

10521990 is an abundant number, since it is smaller than the sum of its proper divisors (16835418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10521990 is a wasteful number, since it uses less digits than its factorization.

10521990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116924 (or 116921 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 10521990 is about 3243.7617051812. The cubic root of 10521990 is about 219.1287164761.

It can be divided in two parts, 10521 and 990, that added together give a palindrome (11511).

The spelling of 10521990 in words is "ten million, five hundred twenty-one thousand, nine hundred ninety".