127089889921 has 2 divisors, whose sum is σ = 127089889922. Its totient is φ = 127089889920.

The previous prime is 127089889859. The next prime is 127089889951. The reversal of 127089889921 is 129988980721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116663233600 + 10426656321 = 341560^2 + 102111^2 .

It is an emirp because it is prime and its reverse (129988980721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 127089889921 - 2¹⁹ = 127089365633 is a prime.

It is a super-4 number, since 4×127089889921⁴ (a number of 46 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (127089889951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63544944960 + 63544944961.

It is an arithmetic number, because the mean of its divisors is an integer number (63544944961).

Almost surely, 2^127089889921 is an apocalyptic number.

It is an amenable number.

127089889921 is a deficient number, since it is larger than the sum of its proper divisors (1).

127089889921 is an equidigital number, since it uses as much as digits as its factorization.

127089889921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10450944, while the sum is 64.

The spelling of 127089889921 in words is "one hundred twenty-seven billion, eighty-nine million, eight hundred eighty-nine thousand, nine hundred twenty-one".