1021221379 has 2 divisors, whose sum is σ = 1021221380. Its totient is φ = 1021221378.

The previous prime is 1021221371. The next prime is 1021221469. The reversal of 1021221379 is 9731221201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021221379 - 2³ = 1021221371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021221371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610689 + 510610690.

It is an arithmetic number, because the mean of its divisors is an integer number (510610690).

Almost surely, 2^1021221379 is an apocalyptic number.

1021221379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021221379 is an equidigital number, since it uses as much as digits as its factorization.

1021221379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1021221379 is about 31956.5545545824. The cubic root of 1021221379 is about 1007.0243361714.

The spelling of 1021221379 in words is "one billion, twenty-one million, two hundred twenty-one thousand, three hundred seventy-nine".