21920227 has 8 divisors (see below), whose sum is σ = 25282400. Its totient is φ = 18615744.

The previous prime is 21920203. The next prime is 21920251. The reversal of 21920227 is 72202912.

It is an interprime number because it is at equal distance from previous prime (21920203) and next prime (21920251).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21920227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21920827) 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, 13602 + ... + 15127.

It is an arithmetic number, because the mean of its divisors is an integer number (3160300).

Almost surely, 2^21920227 is an apocalyptic number.

21920227 is a deficient number, since it is larger than the sum of its proper divisors (3362173).

21920227 is a wasteful number, since it uses less digits than its factorization.

21920227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28845.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21920227 is about 4681.9042066236. The cubic root of 21920227 is about 279.8648454864.

The spelling of 21920227 in words is "twenty-one million, nine hundred twenty thousand, two hundred twenty-seven".