21875132 has 24 divisors (see below), whose sum is σ = 39639600. Its totient is φ = 10555776.

The previous prime is 21875131. The next prime is 21875143. The reversal of 21875132 is 23157812.

It is a junction number, because it is equal to n+sod(n) for n = 21875095 and 21875104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21875131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14594 + ... + 16022.

It is an arithmetic number, because the mean of its divisors is an integer number (1651650).

Almost surely, 2^21875132 is an apocalyptic number.

It is an amenable number.

21875132 is a deficient number, since it is larger than the sum of its proper divisors (17764468).

21875132 is a wasteful number, since it uses less digits than its factorization.

21875132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565 (or 1563 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 21875132 is about 4677.0858448397. The cubic root of 21875132 is about 279.6727980599.

The spelling of 21875132 in words is "twenty-one million, eight hundred seventy-five thousand, one hundred thirty-two".