21923108 has 6 divisors (see below), whose sum is σ = 38365446. Its totient is φ = 10961552.

The previous prime is 21923089. The next prime is 21923119. The reversal of 21923108 is 80132912.

It can be written as a sum of positive squares in only one way, i.e., 18992164 + 2930944 = 4358^2 + 1712^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2740385 + ... + 2740392.

It is an arithmetic number, because the mean of its divisors is an integer number (6394241).

Almost surely, 2^21923108 is an apocalyptic number.

It is an amenable number.

21923108 is a deficient number, since it is larger than the sum of its proper divisors (16442338).

21923108 is a wasteful number, since it uses less digits than its factorization.

21923108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5480781 (or 5480779 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21923108 is about 4682.2118704732. The cubic root of 21923108 is about 279.8771059327.

The spelling of 21923108 in words is "twenty-one million, nine hundred twenty-three thousand, one hundred eight".