21190670 has 32 divisors (see below), whose sum is σ = 41700096. Its totient is φ = 7718400.

The previous prime is 21190667. The next prime is 21190679. The reversal of 21190670 is 7609112.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21190679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3260 + ... + 7280.

It is an arithmetic number, because the mean of its divisors is an integer number (1303128).

Almost surely, 2^21190670 is an apocalyptic number.

21190670 is a deficient number, since it is larger than the sum of its proper divisors (20509426).

21190670 is a wasteful number, since it uses less digits than its factorization.

21190670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4076.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 21190670 is about 4603.3324885348. The cubic root of 21190670 is about 276.7248937946.

Adding to 21190670 its reverse (7609112), we get a palindrome (28799782).

The spelling of 21190670 in words is "twenty-one million, one hundred ninety thousand, six hundred seventy".