21929108 has 12 divisors (see below), whose sum is σ = 38546592. Its totient is φ = 10915800.

The previous prime is 21929107. The next prime is 21929129. The reversal of 21929108 is 80192912.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21929101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11168 + ... + 12983.

It is an arithmetic number, because the mean of its divisors is an integer number (3212216).

Almost surely, 2^21929108 is an apocalyptic number.

It is an amenable number.

21929108 is a deficient number, since it is larger than the sum of its proper divisors (16617484).

21929108 is a wasteful number, since it uses less digits than its factorization.

21929108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24382 (or 24380 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 21929108 is about 4682.8525494617. The cubic root of 21929108 is about 279.9026362159.

The spelling of 21929108 in words is "twenty-one million, nine hundred twenty-nine thousand, one hundred eight".