1280207221 has 2 divisors, whose sum is σ = 1280207222. Its totient is φ = 1280207220.

The previous prime is 1280207167. The next prime is 1280207231. The reversal of 1280207221 is 1227020821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1273704721 + 6502500 = 35689^2 + 2550^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280207221 - 2²⁹ = 743336309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280207231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640103610 + 640103611.

It is an arithmetic number, because the mean of its divisors is an integer number (640103611).

Almost surely, 2^1280207221 is an apocalyptic number.

It is an amenable number.

1280207221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280207221 is an equidigital number, since it uses as much as digits as its factorization.

1280207221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 1280207221 is about 35779.9835243115. The cubic root of 1280207221 is about 1085.8256355944.

The spelling of 1280207221 in words is "one billion, two hundred eighty million, two hundred seven thousand, two hundred twenty-one".