27421327581 has 8 divisors (see below), whose sum is σ = 36562562784. Its totient is φ = 18280488720.

The previous prime is 27421327561. The next prime is 27421327601. The reversal of 27421327581 is 18572312472.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (27421327561) and next prime (27421327601).

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

It is not a de Polignac number, because 27421327581 - 2⁹ = 27421327069 is a prime.

It is a super-2 number, since 2×27421327581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27421327561) 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, 156630 + ... + 281736.

It is an arithmetic number, because the mean of its divisors is an integer number (4570320348).

Almost surely, 2^27421327581 is an apocalyptic number.

It is an amenable number.

27421327581 is a deficient number, since it is larger than the sum of its proper divisors (9141235203).

27421327581 is a wasteful number, since it uses less digits than its factorization.

27421327581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198171.

The product of its digits is 188160, while the sum is 42.

The spelling of 27421327581 in words is "twenty-seven billion, four hundred twenty-one million, three hundred twenty-seven thousand, five hundred eighty-one".