21576532 has 6 divisors (see below), whose sum is σ = 37758938. Its totient is φ = 10788264.

The previous prime is 21576523. The next prime is 21576539. The reversal of 21576532 is 23567512.

It can be written as a sum of positive squares in only one way, i.e., 17943696 + 3632836 = 4236^2 + 1906^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21576494 and 21576503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21576539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2697063 + ... + 2697070.

Almost surely, 2^21576532 is an apocalyptic number.

It is an amenable number.

21576532 is a deficient number, since it is larger than the sum of its proper divisors (16182406).

21576532 is a wasteful number, since it uses less digits than its factorization.

21576532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394137 (or 5394135 counting only the distinct ones).

The product of its digits is 12600, while the sum is 31.

The square root of 21576532 is about 4645.0545744910. The cubic root of 21576532 is about 278.3944334609.

The spelling of 21576532 in words is "twenty-one million, five hundred seventy-six thousand, five hundred thirty-two".