27121381 has 8 divisors (see below), whose sum is σ = 31037184. Its totient is φ = 23215920.

The previous prime is 27121321. The next prime is 27121403. The reversal of 27121381 is 18312172.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27121381 - 2¹⁵ = 27088613 is a prime.

It is a super-2 number, since 2×27121381² = 1471138614694322, which 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 (27121321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4251 + ... + 8503.

It is an arithmetic number, because the mean of its divisors is an integer number (3879648).

Almost surely, 2^27121381 is an apocalyptic number.

It is an amenable number.

27121381 is a deficient number, since it is larger than the sum of its proper divisors (3915803).

27121381 is an equidigital number, since it uses as much as digits as its factorization.

27121381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5171.

The product of its digits is 672, while the sum is 25.

The square root of 27121381 is about 5207.8192172924. The cubic root of 27121381 is about 300.4488872584.

The spelling of 27121381 in words is "twenty-seven million, one hundred twenty-one thousand, three hundred eighty-one".