21682152 has 24 divisors (see below), whose sum is σ = 58722690. Its totient is φ = 7227360.

The previous prime is 21682151. The next prime is 21682163. The reversal of 21682152 is 25128612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13003236 + 8678916 = 3606^2 + 2946^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21682152² = 940231430702208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21682151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 150499 + ... + 150642.

Almost surely, 2^21682152 is an apocalyptic number.

It is an amenable number.

21682152 is an abundant number, since it is smaller than the sum of its proper divisors (37040538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21682152 is a wasteful number, since it uses less digits than its factorization.

21682152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301153 (or 301146 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 21682152 is about 4656.4097757822. The cubic root of 21682152 is about 278.8479535362.

The spelling of 21682152 in words is "twenty-one million, six hundred eighty-two thousand, one hundred fifty-two".