127226870821 has 2 divisors, whose sum is σ = 127226870822. Its totient is φ = 127226870820.

The previous prime is 127226870783. The next prime is 127226870857. The reversal of 127226870821 is 128078622721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119172705796 + 8054165025 = 345214^2 + 89745^2 .

It is a cyclic number.

It is not a de Polignac number, because 127226870821 - 2²⁵ = 127193316389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127226870861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63613435410 + 63613435411.

It is an arithmetic number, because the mean of its divisors is an integer number (63613435411).

Almost surely, 2^127226870821 is an apocalyptic number.

It is an amenable number.

127226870821 is a deficient number, since it is larger than the sum of its proper divisors (1).

127226870821 is an equidigital number, since it uses as much as digits as its factorization.

127226870821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 301056, while the sum is 46.

The spelling of 127226870821 in words is "one hundred twenty-seven billion, two hundred twenty-six million, eight hundred seventy thousand, eight hundred twenty-one".