21877532 has 12 divisors (see below), whose sum is σ = 38356080. Its totient is φ = 10918656.

The previous prime is 21877529. The next prime is 21877561. The reversal of 21877532 is 23577812.

It is a super-2 number, since 2×21877532² = 957252812822048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21877492 and 21877501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2432 + ... + 7047.

It is an arithmetic number, because the mean of its divisors is an integer number (3196340).

Almost surely, 2^21877532 is an apocalyptic number.

It is an amenable number.

21877532 is a deficient number, since it is larger than the sum of its proper divisors (16478548).

21877532 is a wasteful number, since it uses less digits than its factorization.

21877532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10060 (or 10058 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 21877532 is about 4677.3424078209. The cubic root of 21877532 is about 279.6830256580.

The spelling of 21877532 in words is "twenty-one million, eight hundred seventy-seven thousand, five hundred thirty-two".