21070668 has 24 divisors (see below), whose sum is σ = 51303168. Its totient is φ = 6718096.

The previous prime is 21070657. The next prime is 21070703. The reversal of 21070668 is 86607012.

It is a happy number.

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, 37896 + ... + 38447.

It is an arithmetic number, because the mean of its divisors is an integer number (2137632).

Almost surely, 2^21070668 is an apocalyptic number.

It is an amenable number.

21070668 is an abundant number, since it is smaller than the sum of its proper divisors (30232500).

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

21070668 is a wasteful number, since it uses less digits than its factorization.

21070668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76373 (or 76371 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 21070668 is about 4590.2797300382. The cubic root of 21070668 is about 276.2015436121.

The spelling of 21070668 in words is "twenty-one million, seventy thousand, six hundred sixty-eight".