21427375229 has 32 divisors (see below), whose sum is σ = 25883585280. Its totient is φ = 17522998272.

The previous prime is 21427375219. The next prime is 21427375259. The reversal of 21427375229 is 92257372412.

It is not a de Polignac number, because 21427375229 - 2¹⁶ = 21427309693 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21427375229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21427375219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 642992 + ... + 675494.

It is an arithmetic number, because the mean of its divisors is an integer number (808862040).

Almost surely, 2^21427375229 is an apocalyptic number.

It is an amenable number.

21427375229 is a deficient number, since it is larger than the sum of its proper divisors (4456210051).

21427375229 is a wasteful number, since it uses less digits than its factorization.

21427375229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32709.

The product of its digits is 423360, while the sum is 44.

The spelling of 21427375229 in words is "twenty-one billion, four hundred twenty-seven million, three hundred seventy-five thousand, two hundred twenty-nine".