1021996139 has 2 divisors, whose sum is σ = 1021996140. Its totient is φ = 1021996138.

The previous prime is 1021996133. The next prime is 1021996147. The reversal of 1021996139 is 9316991201.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021996139 is a prime.

It is a super-2 number, since 2×1021996139² = 2088952216261814642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1021996096 and 1021996105.

It is not a weakly prime, because it can be changed into another prime (1021996133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510998069 + 510998070.

It is an arithmetic number, because the mean of its divisors is an integer number (510998070).

Almost surely, 2^1021996139 is an apocalyptic number.

1021996139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021996139 is an equidigital number, since it uses as much as digits as its factorization.

1021996139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 1021996139 is about 31968.6743391089. The cubic root of 1021996139 is about 1007.2789348872.

The spelling of 1021996139 in words is "one billion, twenty-one million, nine hundred ninety-six thousand, one hundred thirty-nine".