127195021 has 2 divisors, whose sum is σ = 127195022. Its totient is φ = 127195020.

The previous prime is 127194983. The next prime is 127195121. The reversal of 127195021 is 120591721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108368100 + 18826921 = 10410^2 + 4339^2 .

It is a cyclic number.

It is not a de Polignac number, because 127195021 - 2¹⁵ = 127162253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127195121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63597510 + 63597511.

It is an arithmetic number, because the mean of its divisors is an integer number (63597511).

Almost surely, 2^127195021 is an apocalyptic number.

It is an amenable number.

127195021 is a deficient number, since it is larger than the sum of its proper divisors (1).

127195021 is an equidigital number, since it uses as much as digits as its factorization.

127195021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 127195021 is about 11278.0770080719. The cubic root of 127195021 is about 502.9097287765.

The spelling of 127195021 in words is "one hundred twenty-seven million, one hundred ninety-five thousand, twenty-one".