21880332 has 36 divisors (see below), whose sum is σ = 55495440. Its totient is φ = 7268832.

The previous prime is 21880321. The next prime is 21880367. The reversal of 21880332 is 23308812.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 21880296 and 21880305.

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 11 ways as a sum of consecutive naturals, for example, 12078 + ... + 13770.

It is an arithmetic number, because the mean of its divisors is an integer number (1541540).

Almost surely, 2^21880332 is an apocalyptic number.

It is an amenable number.

21880332 is an abundant number, since it is smaller than the sum of its proper divisors (33615108).

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

21880332 is a wasteful number, since it uses less digits than its factorization.

21880332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062 (or 2057 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 21880332 is about 4677.6417135133. The cubic root of 21880332 is about 279.6949569103.

The spelling of 21880332 in words is "twenty-one million, eight hundred eighty thousand, three hundred thirty-two".