21613532 has 12 divisors (see below), whose sum is σ = 38279976. Its totient is φ = 10676400.

The previous prime is 21613517. The next prime is 21613577. The reversal of 21613532 is 23531612.

It is a junction number, because it is equal to n+sod(n) for n = 21613498 and 21613507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32219 + ... + 32882.

It is an arithmetic number, because the mean of its divisors is an integer number (3189998).

Almost surely, 2^21613532 is an apocalyptic number.

It is an amenable number.

21613532 is a deficient number, since it is larger than the sum of its proper divisors (16666444).

21613532 is a wasteful number, since it uses less digits than its factorization.

21613532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65188 (or 65186 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 21613532 is about 4649.0355989173. The cubic root of 21613532 is about 278.5534752651.

The spelling of 21613532 in words is "twenty-one million, six hundred thirteen thousand, five hundred thirty-two".