2120212121591 has 2 divisors, whose sum is σ = 2120212121592. Its totient is φ = 2120212121590.

The previous prime is 2120212121579. The next prime is 2120212121593. The reversal of 2120212121591 is 1951212120212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2120212121591 - 2⁶ = 2120212121527 is a prime.

Together with 2120212121593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120212121593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060106060795 + 1060106060796.

It is an arithmetic number, because the mean of its divisors is an integer number (1060106060796).

Almost surely, 2^{2120212121591} is an apocalyptic number.

2120212121591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120212121591 is an equidigital number, since it uses as much as digits as its factorization.

2120212121591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The spelling of 2120212121591 in words is "two trillion, one hundred twenty billion, two hundred twelve million, one hundred twenty-one thousand, five hundred ninety-one".