21202670 has 16 divisors (see below), whose sum is σ = 40173840. Its totient is φ = 8034624.

The previous prime is 21202669. The next prime is 21202681. The reversal of 21202670 is 7620212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55607 + ... + 55986.

It is an arithmetic number, because the mean of its divisors is an integer number (2510865).

Almost surely, 2^21202670 is an apocalyptic number.

21202670 is a deficient number, since it is larger than the sum of its proper divisors (18971170).

21202670 is a wasteful number, since it uses less digits than its factorization.

21202670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111619.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21202670 is about 4604.6357076320. The cubic root of 21202670 is about 276.7771191702. Note that the first 3 decimals are identical.

Adding to 21202670 its reverse (7620212), we get a palindrome (28822882).

The spelling of 21202670 in words is "twenty-one million, two hundred two thousand, six hundred seventy".