10521540 has 36 divisors (see below), whose sum is σ = 31915884. Its totient is φ = 2805696.

The previous prime is 10521503. The next prime is 10521559. The reversal of 10521540 is 4512501.

10521540 is a `hidden beast` number, since 105 + 21 + 540 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1557504 + 8964036 = 1248^2 + 2994^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×10521540² = 221405607943200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 15.

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, 29047 + ... + 29406.

Almost surely, 2^10521540 is an apocalyptic number.

10521540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10521540 is an abundant number, since it is smaller than the sum of its proper divisors (21394344).

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

10521540 is a wasteful number, since it uses less digits than its factorization.

10521540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58468 (or 58463 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 10521540 is about 3243.6923405280. The cubic root of 10521540 is about 219.1255925636.

The spelling of 10521540 in words is "ten million, five hundred twenty-one thousand, five hundred forty".