21196670 has 16 divisors (see below), whose sum is σ = 41622768. Its totient is φ = 7707840.

The previous prime is 21196657. The next prime is 21196687. The reversal of 21196670 is 7669112.

It is a happy number.

It is a Curzon 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, 96239 + ... + 96458.

It is an arithmetic number, because the mean of its divisors is an integer number (2601423).

Almost surely, 2^21196670 is an apocalyptic number.

21196670 is a deficient number, since it is larger than the sum of its proper divisors (20426098).

21196670 is a wasteful number, since it uses less digits than its factorization.

21196670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192715.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 21196670 is about 4603.9841441951. The cubic root of 21196670 is about 276.7510089462.

It can be divided in two parts, 21 and 196670, that added together give a palindrome (196691).

The spelling of 21196670 in words is "twenty-one million, one hundred ninety-six thousand, six hundred seventy".