21880930 has 16 divisors (see below), whose sum is σ = 39688704. Its totient is φ = 8685040.

The previous prime is 21880919. The next prime is 21880967. The reversal of 21880930 is 3908812.

It is a junction number, because it is equal to n+sod(n) for n = 21880892 and 21880901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7042 + ... + 9661.

It is an arithmetic number, because the mean of its divisors is an integer number (2480544).

Almost surely, 2^21880930 is an apocalyptic number.

21880930 is a deficient number, since it is larger than the sum of its proper divisors (17807774).

21880930 is a wasteful number, since it uses less digits than its factorization.

21880930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16841.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21880930 is about 4677.7056341758. The cubic root of 21880930 is about 279.6975049530.

The spelling of 21880930 in words is "twenty-one million, eight hundred eighty thousand, nine hundred thirty".