2021111019923 has 2 divisors, whose sum is σ = 2021111019924. Its totient is φ = 2021111019922.

The previous prime is 2021111019901. The next prime is 2021111020039. The reversal of 2021111019923 is 3299101111202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2021111019923 - 2¹² = 2021111015827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021111019923.

It is not a weakly prime, because it can be changed into another prime (2021111019023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010555509961 + 1010555509962.

It is an arithmetic number, because the mean of its divisors is an integer number (1010555509962).

Almost surely, 2^{2021111019923} is an apocalyptic number.

2021111019923 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021111019923 is an equidigital number, since it uses as much as digits as its factorization.

2021111019923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 2021111019923 in words is "two trillion, twenty-one billion, one hundred eleven million, nineteen thousand, nine hundred twenty-three".