82127157221 has 4 divisors (see below), whose sum is σ = 86449639200. Its totient is φ = 77804675244.

The previous prime is 82127157169. The next prime is 82127157353. The reversal of 82127157221 is 12275172128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82127157221 - 2⁶ = 82127157157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82127157821) 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, 2161240961 + ... + 2161240998.

It is an arithmetic number, because the mean of its divisors is an integer number (21612409800).

Almost surely, 2^82127157221 is an apocalyptic number.

It is an amenable number.

82127157221 is a deficient number, since it is larger than the sum of its proper divisors (4322481979).

82127157221 is a wasteful number, since it uses less digits than its factorization.

82127157221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4322481978.

The product of its digits is 31360, while the sum is 38.

The spelling of 82127157221 in words is "eighty-two billion, one hundred twenty-seven million, one hundred fifty-seven thousand, two hundred twenty-one".