21522652 has 12 divisors (see below), whose sum is σ = 37766680. Its totient is φ = 10732176.

The previous prime is 21522619. The next prime is 21522671. The reversal of 21522652 is 25622512.

It is a happy number.

It is a super-2 number, since 2×21522652² = 926449098226208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5583 + ... + 8614.

Almost surely, 2^21522652 is an apocalyptic number.

It is an amenable number.

21522652 is a deficient number, since it is larger than the sum of its proper divisors (16244028).

21522652 is a wasteful number, since it uses less digits than its factorization.

21522652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14580 (or 14578 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 21522652 is about 4639.2512326883. The cubic root of 21522652 is about 278.1625087148.

The spelling of 21522652 in words is "twenty-one million, five hundred twenty-two thousand, six hundred fifty-two".