10621521 has 12 divisors (see below), whose sum is σ = 15441972. Its totient is φ = 7034976.

The previous prime is 10621517. The next prime is 10621537. The reversal of 10621521 is 12512601.

It can be written as a sum of positive squares in 2 ways, for example, as 6969600 + 3651921 = 2640^2 + 1911^2 .

It is not a de Polignac number, because 10621521 - 2² = 10621517 is a prime.

It is a super-2 number, since 2×10621521² = 225633416706882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10621494 and 10621503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10621591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2346 + ... + 5171.

It is an arithmetic number, because the mean of its divisors is an integer number (1286831).

Almost surely, 2^10621521 is an apocalyptic number.

It is an amenable number.

10621521 is a deficient number, since it is larger than the sum of its proper divisors (4820451).

10621521 is a wasteful number, since it uses less digits than its factorization.

10621521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7680 (or 7677 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 10621521 is about 3259.0675046706. The cubic root of 10621521 is about 219.8174863683.

It can be divided in two parts, 1062152 and 1, that added together give a triangular number (1062153 = T₁₄₅₇).

The spelling of 10621521 in words is "ten million, six hundred twenty-one thousand, five hundred twenty-one".