2121934796647 has 2 divisors, whose sum is σ = 2121934796648. Its totient is φ = 2121934796646.

The previous prime is 2121934796621. The next prime is 2121934796671. The reversal of 2121934796647 is 7466974391212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121934796647 - 2³¹ = 2119787312999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121934796617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060967398323 + 1060967398324.

It is an arithmetic number, because the mean of its divisors is an integer number (1060967398324).

Almost surely, 2^{2121934796647} is an apocalyptic number.

2121934796647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121934796647 is an equidigital number, since it uses as much as digits as its factorization.

2121934796647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 61.

The spelling of 2121934796647 in words is "two trillion, one hundred twenty-one billion, nine hundred thirty-four million, seven hundred ninety-six thousand, six hundred forty-seven".