21675132 has 18 divisors (see below), whose sum is σ = 54790008. Its totient is φ = 7225032.

The previous prime is 21675113. The next prime is 21675133. The reversal of 21675132 is 23157612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×21675132² = 939622694434848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21675096 and 21675105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21675133) 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, 301008 + ... + 301079.

Almost surely, 2^21675132 is an apocalyptic number.

It is an amenable number.

21675132 is an abundant number, since it is smaller than the sum of its proper divisors (33114876).

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

21675132 is a wasteful number, since it uses less digits than its factorization.

21675132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602097 (or 602092 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 21675132 is about 4655.6559151209. The cubic root of 21675132 is about 278.8178562173.

The spelling of 21675132 in words is "twenty-one million, six hundred seventy-five thousand, one hundred thirty-two".