127201427087621 has 2 divisors, whose sum is σ = 127201427087622. Its totient is φ = 127201427087620.

The previous prime is 127201427087617. The next prime is 127201427087633. The reversal of 127201427087621 is 126780724102721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111358527549025 + 15842899538596 = 10552655^2 + 3980314^2 .

It is a cyclic number.

It is not a de Polignac number, because 127201427087621 - 2² = 127201427087617 is a prime.

It is a super-2 number, since 2×127201427087621² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 127201427087621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127201427087321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63600713543810 + 63600713543811.

It is an arithmetic number, because the mean of its divisors is an integer number (63600713543811).

Almost surely, 2^{127201427087621} is an apocalyptic number.

It is an amenable number.

127201427087621 is a deficient number, since it is larger than the sum of its proper divisors (1).

127201427087621 is an equidigital number, since it uses as much as digits as its factorization.

127201427087621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1053696, while the sum is 50.

The spelling of 127201427087621 in words is "one hundred twenty-seven trillion, two hundred one billion, four hundred twenty-seven million, eighty-seven thousand, six hundred twenty-one".