21880998 has 24 divisors (see below), whose sum is σ = 47595600. Its totient is φ = 7264944.

The previous prime is 21880979. The next prime is 21881017. The reversal of 21880998 is 89908812.

It is an interprime number because it is at equal distance from previous prime (21880979) and next prime (21881017).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2583 + ... + 7101.

It is an arithmetic number, because the mean of its divisors is an integer number (1983150).

Almost surely, 2^21880998 is an apocalyptic number.

21880998 is an abundant number, since it is smaller than the sum of its proper divisors (25714602).

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

21880998 is a wasteful number, since it uses less digits than its factorization.

21880998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4796 (or 4793 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 21880998 is about 4677.7129026908. The cubic root of 21880998 is about 279.6977946940.

The spelling of 21880998 in words is "twenty-one million, eight hundred eighty thousand, nine hundred ninety-eight".