21907227 has 16 divisors (see below), whose sum is σ = 29836800. Its totient is φ = 14294592.

The previous prime is 21907189. The next prime is 21907229. The reversal of 21907227 is 72270912.

It is a happy number.

It is not a de Polignac number, because 21907227 - 2¹² = 21903131 is a prime.

21907227 is a modest number, since divided by 7227 gives 2190 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 21907194 and 21907203.

It is not an unprimeable number, because it can be changed into a prime (21907229) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 36274 + ... + 36872.

It is an arithmetic number, because the mean of its divisors is an integer number (1864800).

Almost surely, 2^21907227 is an apocalyptic number.

21907227 is a deficient number, since it is larger than the sum of its proper divisors (7929573).

21907227 is a wasteful number, since it uses less digits than its factorization.

21907227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 21907227 is about 4680.5156767177. The cubic root of 21907227 is about 279.8095090391.

The spelling of 21907227 in words is "twenty-one million, nine hundred seven thousand, two hundred twenty-seven".