1021396979 has 2 divisors, whose sum is σ = 1021396980. Its totient is φ = 1021396978.

The previous prime is 1021396969. The next prime is 1021397051. The reversal of 1021396979 is 9796931201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021396979 - 2²⁸ = 752961523 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021396939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510698489 + 510698490.

It is an arithmetic number, because the mean of its divisors is an integer number (510698490).

Almost surely, 2^1021396979 is an apocalyptic number.

1021396979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021396979 is an equidigital number, since it uses as much as digits as its factorization.

1021396979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 1021396979 is about 31959.3019166564. The cubic root of 1021396979 is about 1007.0820524650.

The spelling of 1021396979 in words is "one billion, twenty-one million, three hundred ninety-six thousand, nine hundred seventy-nine".