1021021979 has 2 divisors, whose sum is σ = 1021021980. Its totient is φ = 1021021978.

The previous prime is 1021021909. The next prime is 1021021997. The reversal of 1021021979 is 9791201201.

Together with next prime (1021021997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021021979 - 2²⁰ = 1019973403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021021909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510510989 + 510510990.

It is an arithmetic number, because the mean of its divisors is an integer number (510510990).

Almost surely, 2^1021021979 is an apocalyptic number.

1021021979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021021979 is an equidigital number, since it uses as much as digits as its factorization.

1021021979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 1021021979 is about 31953.4345415325. The cubic root of 1021021979 is about 1006.9587892595.

The spelling of 1021021979 in words is "one billion, twenty-one million, twenty-one thousand, nine hundred seventy-nine".