2156120812019 has 2 divisors, whose sum is σ = 2156120812020. Its totient is φ = 2156120812018.

The previous prime is 2156120811991. The next prime is 2156120812067. The reversal of 2156120812019 is 9102180216512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156120812019 is a prime.

It is a super-2 number, since 2×2156120812019² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2156120812099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078060406009 + 1078060406010.

It is an arithmetic number, because the mean of its divisors is an integer number (1078060406010).

Almost surely, 2^{2156120812019} is an apocalyptic number.

2156120812019 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156120812019 is an equidigital number, since it uses as much as digits as its factorization.

2156120812019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 38.

The spelling of 2156120812019 in words is "two trillion, one hundred fifty-six billion, one hundred twenty million, eight hundred twelve thousand, nineteen".