21909319227 has 6 divisors (see below), whose sum is σ = 31646794452. Its totient is φ = 14606212812.

The previous prime is 21909319219. The next prime is 21909319249. The reversal of 21909319227 is 72291390912.

21909319227 is a `hidden beast` number, since 21 + 90 + 9 + 319 + 227 = 666.

It is not a de Polignac number, because 21909319227 - 2³ = 21909319219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21909319217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1217184393 + ... + 1217184410.

It is an arithmetic number, because the mean of its divisors is an integer number (5274465742).

Almost surely, 2^21909319227 is an apocalyptic number.

21909319227 is a deficient number, since it is larger than the sum of its proper divisors (9737475225).

21909319227 is a wasteful number, since it uses less digits than its factorization.

21909319227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434368809 (or 2434368806 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 21909319227 in words is "twenty-one billion, nine hundred nine million, three hundred nineteen thousand, two hundred twenty-seven".