2111987904473 has 2 divisors, whose sum is σ = 2111987904474. Its totient is φ = 2111987904472.

The previous prime is 2111987904457. The next prime is 2111987904491. The reversal of 2111987904473 is 3744097891112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2111987879824 + 24649 = 1453268^2 + 157^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111987904473 - 2⁴ = 2111987904457 is a prime.

It is not a weakly prime, because it can be changed into another prime (2111987904673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055993952236 + 1055993952237.

It is an arithmetic number, because the mean of its divisors is an integer number (1055993952237).

Almost surely, 2^{2111987904473} is an apocalyptic number.

It is an amenable number.

2111987904473 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111987904473 is an equidigital number, since it uses as much as digits as its factorization.

2111987904473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 2111987904473 in words is "two trillion, one hundred eleven billion, nine hundred eighty-seven million, nine hundred four thousand, four hundred seventy-three".