1297868221 has 16 divisors (see below), whose sum is σ = 1424364480. Its totient is φ = 1175391360.

The previous prime is 1297868171. The next prime is 1297868237. The reversal of 1297868221 is 1228687921.

It is a de Polignac number, because none of the positive numbers 2^k-1297868221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297868021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147286 + ... + 155848.

It is an arithmetic number, because the mean of its divisors is an integer number (89022780).

Almost surely, 2^1297868221 is an apocalyptic number.

It is an amenable number.

1297868221 is a deficient number, since it is larger than the sum of its proper divisors (126496259).

1297868221 is a wasteful number, since it uses less digits than its factorization.

1297868221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8796.

The product of its digits is 193536, while the sum is 46.

The square root of 1297868221 is about 36025.9381696022. The cubic root of 1297868221 is about 1090.7959904108.

The spelling of 1297868221 in words is "one billion, two hundred ninety-seven million, eight hundred sixty-eight thousand, two hundred twenty-one".