1295100221 has 2 divisors, whose sum is σ = 1295100222. Its totient is φ = 1295100220.

The previous prime is 1295100217. The next prime is 1295100223. The reversal of 1295100221 is 1220015921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 851997721 + 443102500 = 29189^2 + 21050^2 .

It is a cyclic number.

It is not a de Polignac number, because 1295100221 - 2² = 1295100217 is a prime.

Together with 1295100223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1295100223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 647550110 + 647550111.

It is an arithmetic number, because the mean of its divisors is an integer number (647550111).

Almost surely, 2^1295100221 is an apocalyptic number.

It is an amenable number.

1295100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1295100221 is an equidigital number, since it uses as much as digits as its factorization.

1295100221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 1295100221 is about 35987.5008996179. The cubic root of 1295100221 is about 1090.0199813973.

The spelling of 1295100221 in words is "one billion, two hundred ninety-five million, one hundred thousand, two hundred twenty-one".