21471428227 has 16 divisors (see below), whose sum is σ = 22890470400. Its totient is φ = 20104074720.

The previous prime is 21471428221. The next prime is 21471428261. The reversal of 21471428227 is 72282417412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21471428227 is a prime.

It is a super-2 number, since 2×21471428227² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21471428227.

It is not an unprimeable number, because it can be changed into a prime (21471428221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153024 + ... + 257602.

It is an arithmetic number, because the mean of its divisors is an integer number (1430654400).

Almost surely, 2^21471428227 is an apocalyptic number.

21471428227 is a deficient number, since it is larger than the sum of its proper divisors (1419042173).

21471428227 is a wasteful number, since it uses less digits than its factorization.

21471428227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104826.

The product of its digits is 100352, while the sum is 40.

The spelling of 21471428227 in words is "twenty-one billion, four hundred seventy-one million, four hundred twenty-eight thousand, two hundred twenty-seven".