21946008 has 32 divisors (see below), whose sum is σ = 62703360. Its totient is φ = 6270240.

The previous prime is 21946003. The next prime is 21946009. The reversal of 21946008 is 80064912.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21946003) 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, 65148 + ... + 65483.

It is an arithmetic number, because the mean of its divisors is an integer number (1959480).

Almost surely, 2^21946008 is an apocalyptic number.

21946008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21946008 is an abundant number, since it is smaller than the sum of its proper divisors (40757352).

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

21946008 is a wasteful number, since it uses less digits than its factorization.

21946008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130647 (or 130643 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 21946008 is about 4684.6566576431. The cubic root of 21946008 is about 279.9745214912.

The spelling of 21946008 in words is "twenty-one million, nine hundred forty-six thousand, eight".