21341908 has 12 divisors (see below), whose sum is σ = 42683872. Its totient is φ = 9146520.

The previous prime is 21341897. The next prime is 21341911. The reversal of 21341908 is 80914312.

It is a happy number.

21341908 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 762211 = 21341908 / (2 + 1 + 3 + 4 + 1 + 9 + 0 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381078 + ... + 381133.

Almost surely, 2^21341908 is an apocalyptic number.

21341908 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21341908 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21341908 is a wasteful number, since it uses less digits than its factorization.

21341908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762222 (or 762220 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21341908 is about 4619.7302951579. The cubic root of 21341908 is about 277.3816631492.

The spelling of 21341908 in words is "twenty-one million, three hundred forty-one thousand, nine hundred eight".