127212421 has 4 divisors (see below), whose sum is σ = 145385632. Its totient is φ = 109039212.

The previous prime is 127212419. The next prime is 127212427. The reversal of 127212421 is 124212721.

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 127212421 - 2¹ = 127212419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 127212392 and 127212401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127212427) 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, 9086595 + ... + 9086608.

It is an arithmetic number, because the mean of its divisors is an integer number (36346408).

Almost surely, 2^127212421 is an apocalyptic number.

It is an amenable number.

127212421 is a deficient number, since it is larger than the sum of its proper divisors (18173211).

127212421 is an equidigital number, since it uses as much as digits as its factorization.

127212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18173210.

The product of its digits is 448, while the sum is 22.

The square root of 127212421 is about 11278.8483897958. The cubic root of 127212421 is about 502.9326600470.

The spelling of 127212421 in words is "one hundred twenty-seven million, two hundred twelve thousand, four hundred twenty-one".