21522633 has 24 divisors (see below), whose sum is σ = 31805088. Its totient is φ = 12936000.

The previous prime is 21522619. The next prime is 21522671. The reversal of 21522633 is 33622512.

It is not a de Polignac number, because 21522633 - 2⁴ = 21522617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21522673) 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, 76453 + ... + 76733.

It is an arithmetic number, because the mean of its divisors is an integer number (1325212).

Almost surely, 2^21522633 is an apocalyptic number.

It is an amenable number.

21522633 is a deficient number, since it is larger than the sum of its proper divisors (10282455).

21522633 is a wasteful number, since it uses less digits than its factorization.

21522633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517 (or 506 counting only the distinct ones).

The product of its digits is 2160, while the sum is 24.

The square root of 21522633 is about 4639.2491849436. The cubic root of 21522633 is about 278.1624268616.

It can be divided in two parts, 21522 and 633, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 21522633 in words is "twenty-one million, five hundred twenty-two thousand, six hundred thirty-three".