21908382 has 16 divisors (see below), whose sum is σ = 45230592. Its totient is φ = 7067160.

The previous prime is 21908377. The next prime is 21908401. The reversal of 21908382 is 28380912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58708 + ... + 59079.

It is an arithmetic number, because the mean of its divisors is an integer number (2826912).

Almost surely, 2^21908382 is an apocalyptic number.

21908382 is an abundant number, since it is smaller than the sum of its proper divisors (23322210).

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

21908382 is a wasteful number, since it uses less digits than its factorization.

21908382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117823.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 21908382 is about 4680.6390589320. The cubic root of 21908382 is about 279.8144263556.

The spelling of 21908382 in words is "twenty-one million, nine hundred eight thousand, three hundred eighty-two".