127631221 has 4 divisors (see below), whose sum is σ = 127752352. Its totient is φ = 127510092.

The previous prime is 127631213. The next prime is 127631243. The reversal of 127631221 is 122136721.

It is a happy number.

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 127631221 - 2³ = 127631213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127631201) 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, 58971 + ... + 61096.

It is an arithmetic number, because the mean of its divisors is an integer number (31938088).

Almost surely, 2^127631221 is an apocalyptic number.

It is an amenable number.

127631221 is a deficient number, since it is larger than the sum of its proper divisors (121131).

127631221 is a wasteful number, since it uses less digits than its factorization.

127631221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121130.

The product of its digits is 1008, while the sum is 25.

The square root of 127631221 is about 11297.3988599146. The cubic root of 127631221 is about 503.4839622957.

Adding to 127631221 its reverse (122136721), we get a palindrome (249767942).

The spelling of 127631221 in words is "one hundred twenty-seven million, six hundred thirty-one thousand, two hundred twenty-one".