21525662 has 4 divisors (see below), whose sum is σ = 32288496. Its totient is φ = 10762830.

The previous prime is 21525659. The next prime is 21525667. The reversal of 21525662 is 26652512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5381414 + ... + 5381417.

It is an arithmetic number, because the mean of its divisors is an integer number (8072124).

Almost surely, 2^21525662 is an apocalyptic number.

21525662 is a deficient number, since it is larger than the sum of its proper divisors (10762834).

21525662 is a wasteful number, since it uses less digits than its factorization.

21525662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10762833.

The product of its digits is 7200, while the sum is 29.

The square root of 21525662 is about 4639.5756271452. The cubic root of 21525662 is about 278.1754753653.

The spelling of 21525662 in words is "twenty-one million, five hundred twenty-five thousand, six hundred sixty-two".