21860132 has 12 divisors (see below), whose sum is σ = 43720320. Its totient is φ = 9368616.

The previous prime is 21860117. The next prime is 21860183. The reversal of 21860132 is 23106812.

21860132 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21860098 and 21860107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390332 + ... + 390387.

It is an arithmetic number, because the mean of its divisors is an integer number (3643360).

Almost surely, 2^21860132 is an apocalyptic number.

It is an amenable number.

21860132 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21860132 is a wasteful number, since it uses less digits than its factorization.

21860132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780730 (or 780728 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21860132 is about 4675.4820072373. The cubic root of 21860132 is about 279.6088586178.

Adding to 21860132 its reverse (23106812), we get a palindrome (44966944).

The spelling of 21860132 in words is "twenty-one million, eight hundred sixty thousand, one hundred thirty-two".