127473251921 has 4 divisors (see below), whose sum is σ = 128664590832. Its totient is φ = 126281913012.

The previous prime is 127473251909. The next prime is 127473251951. The reversal of 127473251921 is 129152374721.

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, and also an emirpimes, since its reverse is a distinct semiprime: 129152374721 = 17 ⋅7597198513.

It is a cyclic number.

It is not a de Polignac number, because 127473251921 - 2¹⁴ = 127473235537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127473251951) 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, 595669295 + ... + 595669508.

It is an arithmetic number, because the mean of its divisors is an integer number (32166147708).

Almost surely, 2^127473251921 is an apocalyptic number.

It is an amenable number.

127473251921 is a deficient number, since it is larger than the sum of its proper divisors (1191338911).

127473251921 is a wasteful number, since it uses less digits than its factorization.

127473251921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191338910.

The product of its digits is 211680, while the sum is 44.

The spelling of 127473251921 in words is "one hundred twenty-seven billion, four hundred seventy-three million, two hundred fifty-one thousand, nine hundred twenty-one".