21880568 has 16 divisors (see below), whose sum is σ = 41899680. Its totient is φ = 10707328.

The previous prime is 21880559. The next prime is 21880583. The reversal of 21880568 is 86508812.

It is a congruent number.

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, 28721 + ... + 29472.

It is an arithmetic number, because the mean of its divisors is an integer number (2618730).

Almost surely, 2^21880568 is an apocalyptic number.

It is an amenable number.

21880568 is a deficient number, since it is larger than the sum of its proper divisors (20019112).

21880568 is a wasteful number, since it uses less digits than its factorization.

21880568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58246 (or 58242 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 21880568 is about 4677.6669398323. Note that the first 3 decimals coincide. The cubic root of 21880568 is about 279.6959624979.

The spelling of 21880568 in words is "twenty-one million, eight hundred eighty thousand, five hundred sixty-eight".