127221521 has 16 divisors (see below), whose sum is σ = 152332800. Its totient is φ = 103940928.

The previous prime is 127221517. The next prime is 127221559. The reversal of 127221521 is 125122721.

It is not a de Polignac number, because 127221521 - 2² = 127221517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127221121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12071 + ... + 20003.

It is an arithmetic number, because the mean of its divisors is an integer number (9520800).

Almost surely, 2^127221521 is an apocalyptic number.

It is an amenable number.

127221521 is a deficient number, since it is larger than the sum of its proper divisors (25111279).

127221521 is an equidigital number, since it uses as much as digits as its factorization.

127221521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8048.

The product of its digits is 560, while the sum is 23.

The square root of 127221521 is about 11279.2517925614. The cubic root of 127221521 is about 502.9446520051.

The spelling of 127221521 in words is "one hundred twenty-seven million, two hundred twenty-one thousand, five hundred twenty-one".