127400921 has 2 divisors, whose sum is σ = 127400922. Its totient is φ = 127400920.

The previous prime is 127400863. The next prime is 127400929. The reversal of 127400921 is 129004721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102799321 + 24601600 = 10139^2 + 4960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127400921 is a prime.

It is not a weakly prime, because it can be changed into another prime (127400929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63700460 + 63700461.

It is an arithmetic number, because the mean of its divisors is an integer number (63700461).

Almost surely, 2^127400921 is an apocalyptic number.

It is an amenable number.

127400921 is a deficient number, since it is larger than the sum of its proper divisors (1).

127400921 is an equidigital number, since it uses as much as digits as its factorization.

127400921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 127400921 is about 11287.2016461123. The cubic root of 127400921 is about 503.1809482219.

The spelling of 127400921 in words is "one hundred twenty-seven million, four hundred thousand, nine hundred twenty-one".