1021399103 has 2 divisors, whose sum is σ = 1021399104. Its totient is φ = 1021399102.

The previous prime is 1021399087. The next prime is 1021399153. The reversal of 1021399103 is 3019931201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021399103 - 2⁴ = 1021399087 is a prime.

It is a super-2 number, since 2×1021399103² = 2086512255218409218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021399153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510699551 + 510699552.

It is an arithmetic number, because the mean of its divisors is an integer number (510699552).

Almost surely, 2^1021399103 is an apocalyptic number.

1021399103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021399103 is an equidigital number, since it uses as much as digits as its factorization.

1021399103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1021399103 is about 31959.3351464013. The cubic root of 1021399103 is about 1007.0827505419.

The spelling of 1021399103 in words is "one billion, twenty-one million, three hundred ninety-nine thousand, one hundred three".