1297699021 has 8 divisors (see below), whose sum is σ = 1346583744. Its totient is φ = 1249664640.

The previous prime is 1297699009. The next prime is 1297699037. The reversal of 1297699021 is 1209967921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1297699021 - 2⁹ = 1297698509 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 (1297699061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209476 + ... + 215581.

It is an arithmetic number, because the mean of its divisors is an integer number (168322968).

Almost surely, 2^1297699021 is an apocalyptic number.

It is an amenable number.

1297699021 is a deficient number, since it is larger than the sum of its proper divisors (48884723).

1297699021 is an equidigital number, since it uses as much as digits as its factorization.

1297699021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425171.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 1297699021 is about 36023.5897850284. The cubic root of 1297699021 is about 1090.7485868559.

The spelling of 1297699021 in words is "one billion, two hundred ninety-seven million, six hundred ninety-nine thousand, twenty-one".