2000123121391 has 2 divisors, whose sum is σ = 2000123121392. Its totient is φ = 2000123121390.

The previous prime is 2000123121379. The next prime is 2000123121497. The reversal of 2000123121391 is 1931213210002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2000123121391 - 2³⁷ = 1862684167919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2000123121091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000061560695 + 1000061560696.

It is an arithmetic number, because the mean of its divisors is an integer number (1000061560696).

Almost surely, 2^{2000123121391} is an apocalyptic number.

2000123121391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2000123121391 is an equidigital number, since it uses as much as digits as its factorization.

2000123121391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

Adding to 2000123121391 its reverse (1931213210002), we get a palindrome (3931336331393).

The spelling of 2000123121391 in words is "two trillion, one hundred twenty-three million, one hundred twenty-one thousand, three hundred ninety-one".