27161206421 has 4 divisors (see below), whose sum is σ = 27165408972. Its totient is φ = 27157003872.

The previous prime is 27161206417. The next prime is 27161206427. The reversal of 27161206421 is 12460216172.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14985187396 + 12176019025 = 122414^2 + 110345^2 .

It is a cyclic number.

It is not a de Polignac number, because 27161206421 - 2² = 27161206417 is a prime.

It is a super-2 number, since 2×27161206421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27161206427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2091566 + ... + 2104511.

It is an arithmetic number, because the mean of its divisors is an integer number (6791352243).

Almost surely, 2^27161206421 is an apocalyptic number.

It is an amenable number.

27161206421 is a deficient number, since it is larger than the sum of its proper divisors (4202551).

27161206421 is an equidigital number, since it uses as much as digits as its factorization.

27161206421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202550.

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 27161206421 in words is "twenty-seven billion, one hundred sixty-one million, two hundred six thousand, four hundred twenty-one".