27197631621 has 12 divisors (see below), whose sum is σ = 39286995072. Its totient is φ = 18131049576.

The previous prime is 27197631599. The next prime is 27197631673. The reversal of 27197631621 is 12613679172.

27197631621 is a `hidden beast` number, since 2 + 7 + 1 + 9 + 7 + 631 + 6 + 2 + 1 = 666.

It is not a de Polignac number, because 27197631621 - 2¹¹ = 27197629573 is a prime.

It is a super-2 number, since 2×27197631621² (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 (27197631521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 302710 + ... + 382136.

It is an arithmetic number, because the mean of its divisors is an integer number (3273916256).

Almost surely, 2^27197631621 is an apocalyptic number.

It is an amenable number.

27197631621 is a deficient number, since it is larger than the sum of its proper divisors (12089363451).

27197631621 is a wasteful number, since it uses less digits than its factorization.

27197631621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117480 (or 117477 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The spelling of 27197631621 in words is "twenty-seven billion, one hundred ninety-seven million, six hundred thirty-one thousand, six hundred twenty-one".