1021399102 has 16 divisors (see below), whose sum is σ = 1549620720. Its totient is φ = 504878848.

The previous prime is 1021399087. The next prime is 1021399103. The reversal of 1021399102 is 2019931201.

1021399102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1021399102² = 2086512251132812808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021399103) 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, 104238 + ... + 113614.

It is an arithmetic number, because the mean of its divisors is an integer number (96851295).

Almost surely, 2^1021399102 is an apocalyptic number.

1021399102 is a deficient number, since it is larger than the sum of its proper divisors (528221618).

1021399102 is a wasteful number, since it uses less digits than its factorization.

1021399102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9995.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 1021399102 is about 31959.3351307564. The cubic root of 1021399102 is about 1007.0827502132.

The spelling of 1021399102 in words is "one billion, twenty-one million, three hundred ninety-nine thousand, one hundred two".