127672421 has 4 divisors (see below), whose sum is σ = 127994412. Its totient is φ = 127350432.

The previous prime is 127672417. The next prime is 127672423. The reversal of 127672421 is 124276721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124276721 = 3559 ⋅34919.

It can be written as a sum of positive squares in 2 ways, for example, as 105863521 + 21808900 = 10289^2 + 4670^2 .

It is a cyclic number.

It is not a de Polignac number, because 127672421 - 2² = 127672417 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 (127672423) 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, 160400 + ... + 161193.

It is an arithmetic number, because the mean of its divisors is an integer number (31998603).

Almost surely, 2^127672421 is an apocalyptic number.

It is an amenable number.

127672421 is a deficient number, since it is larger than the sum of its proper divisors (321991).

127672421 is an equidigital number, since it uses as much as digits as its factorization.

127672421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321990.

The product of its digits is 9408, while the sum is 32.

The square root of 127672421 is about 11299.2221413688. Note that the first 3 decimals coincide. The cubic root of 127672421 is about 503.5381321857.

The spelling of 127672421 in words is "one hundred twenty-seven million, six hundred seventy-two thousand, four hundred twenty-one".