21970908 has 36 divisors (see below), whose sum is σ = 56372680. Its totient is φ = 7213536.

The previous prime is 21970903. The next prime is 21970913. The reversal of 21970908 is 80907912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21970903) and next prime (21970913).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21970901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2143 + ... + 6966.

Almost surely, 2^21970908 is an apocalyptic number.

It is an amenable number.

21970908 is an abundant number, since it is smaller than the sum of its proper divisors (34401772).

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

21970908 is a wasteful number, since it uses less digits than its factorization.

21970908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9186 (or 9181 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 21970908 is about 4687.3135162905. The cubic root of 21970908 is about 280.0803680863.

The spelling of 21970908 in words is "twenty-one million, nine hundred seventy thousand, nine hundred eight".