2042020221691 has 2 divisors, whose sum is σ = 2042020221692. Its totient is φ = 2042020221690.

The previous prime is 2042020221617. The next prime is 2042020221743. The reversal of 2042020221691 is 1961220202402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2042020221691 is a prime.

It is not a weakly prime, because it can be changed into another prime (2042020221611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1021010110845 + 1021010110846.

It is an arithmetic number, because the mean of its divisors is an integer number (1021010110846).

Almost surely, 2^{2042020221691} is an apocalyptic number.

2042020221691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2042020221691 is an equidigital number, since it uses as much as digits as its factorization.

2042020221691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 2042020221691 in words is "two trillion, forty-two billion, twenty million, two hundred twenty-one thousand, six hundred ninety-one".