10521840 has 80 divisors (see below), whose sum is σ = 37283328. Its totient is φ = 2404608.

The previous prime is 10521821. The next prime is 10521851. The reversal of 10521840 is 4812501.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×10521840² = 221418233971200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1452 + ... + 4811.

Almost surely, 2^10521840 is an apocalyptic number.

10521840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10521840 is an abundant number, since it is smaller than the sum of its proper divisors (26761488).

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

10521840 is a wasteful number, since it uses less digits than its factorization.

10521840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6286 (or 6280 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 10521840 is about 3243.7385837949. The cubic root of 10521840 is about 219.1276751819.

It can be divided in two parts, 105 and 21840, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 10521840 in words is "ten million, five hundred twenty-one thousand, eight hundred forty".