127471797421 has 4 divisors (see below), whose sum is σ = 128253833152. Its totient is φ = 126689761692.

The previous prime is 127471797419. The next prime is 127471797469. The reversal of 127471797421 is 124797174721.

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 127471797421 - 2¹ = 127471797419 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 (127471797491) 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, 391017621 + ... + 391017946.

It is an arithmetic number, because the mean of its divisors is an integer number (32063458288).

Almost surely, 2^127471797421 is an apocalyptic number.

It is an amenable number.

127471797421 is a deficient number, since it is larger than the sum of its proper divisors (782035731).

127471797421 is an equidigital number, since it uses as much as digits as its factorization.

127471797421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782035730.

The product of its digits is 1382976, while the sum is 52.

The spelling of 127471797421 in words is "one hundred twenty-seven billion, four hundred seventy-one million, seven hundred ninety-seven thousand, four hundred twenty-one".