27121231 has 4 divisors (see below), whose sum is σ = 27334912. Its totient is φ = 26907552.

The previous prime is 27121229. The next prime is 27121291. The reversal of 27121231 is 13212172.

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

It is a cyclic number.

It is not a de Polignac number, because 27121231 - 2¹ = 27121229 is a prime.

It is a super-2 number, since 2×27121231² = 1471122341910722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27121199 and 27121208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27121201) 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, 106650 + ... + 106903.

It is an arithmetic number, because the mean of its divisors is an integer number (6833728).

Almost surely, 2^27121231 is an apocalyptic number.

27121231 is a deficient number, since it is larger than the sum of its proper divisors (213681).

27121231 is a wasteful number, since it uses less digits than its factorization.

27121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213680.

The product of its digits is 168, while the sum is 19.

The square root of 27121231 is about 5207.8048158509. The cubic root of 27121231 is about 300.4483333606.

The spelling of 27121231 in words is "twenty-seven million, one hundred twenty-one thousand, two hundred thirty-one".