21230908 has 24 divisors (see below), whose sum is σ = 38674944. Its totient is φ = 10186800.

The previous prime is 21230903. The next prime is 21230921. The reversal of 21230908 is 80903212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15591 + ... + 16897.

It is an arithmetic number, because the mean of its divisors is an integer number (1611456).

Almost surely, 2^21230908 is an apocalyptic number.

It is an amenable number.

21230908 is a deficient number, since it is larger than the sum of its proper divisors (17444036).

21230908 is a wasteful number, since it uses less digits than its factorization.

21230908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473 (or 1471 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21230908 is about 4607.7009451569. The cubic root of 21230908 is about 276.8999364883.

The spelling of 21230908 in words is "twenty-one million, two hundred thirty thousand, nine hundred eight".