127089921 has 16 divisors (see below), whose sum is σ = 194670464. Its totient is φ = 72244224.

The previous prime is 127089889. The next prime is 127089947. The reversal of 127089921 is 129980721.

It is not a de Polignac number, because 127089921 - 2⁵ = 127089889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 127089921.

It is not an unprimeable number, because it can be changed into a prime (127089961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11626 + ... + 19731.

It is an arithmetic number, because the mean of its divisors is an integer number (12166904).

Almost surely, 2^127089921 is an apocalyptic number.

It is an amenable number.

127089921 is a deficient number, since it is larger than the sum of its proper divisors (67580543).

127089921 is a wasteful number, since it uses less digits than its factorization.

127089921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31560.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 127089921 is about 11273.4165628704. The cubic root of 127089921 is about 502.7711741464.

The spelling of 127089921 in words is "one hundred twenty-seven million, eighty-nine thousand, nine hundred twenty-one".