21620158 has 16 divisors (see below), whose sum is σ = 39243744. Its totient is φ = 8720640.

The previous prime is 21620153. The next prime is 21620189. The reversal of 21620158 is 85102612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45183 + ... + 45658.

It is an arithmetic number, because the mean of its divisors is an integer number (2452734).

Almost surely, 2^21620158 is an apocalyptic number.

21620158 is a deficient number, since it is larger than the sum of its proper divisors (17623586).

21620158 is a wasteful number, since it uses less digits than its factorization.

21620158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90867.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 21620158 is about 4649.7481652236. The cubic root of 21620158 is about 278.5819374765.

The spelling of 21620158 in words is "twenty-one million, six hundred twenty thousand, one hundred fifty-eight".