21477127275 has 36 divisors (see below), whose sum is σ = 38477972520. Its totient is φ = 11451475200.

The previous prime is 21477127219. The next prime is 21477127277. The reversal of 21477127275 is 57272177412.

It is not a de Polignac number, because 21477127275 - 2⁹ = 21477126763 is a prime.

It is a super-2 number, since 2×21477127275² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21477127275.

It is not an unprimeable number, because it can be changed into a prime (21477127277) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1052116 + ... + 1072334.

It is an arithmetic number, because the mean of its divisors is an integer number (1068832570).

Almost surely, 2^21477127275 is an apocalyptic number.

21477127275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21477127275 is a deficient number, since it is larger than the sum of its proper divisors (17000845245).

21477127275 is a wasteful number, since it uses less digits than its factorization.

21477127275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24956 (or 24948 counting only the distinct ones).

The product of its digits is 384160, while the sum is 45.

The spelling of 21477127275 in words is "twenty-one billion, four hundred seventy-seven million, one hundred twenty-seven thousand, two hundred seventy-five".