2121199299617 has 2 divisors, whose sum is σ = 2121199299618. Its totient is φ = 2121199299616.

The previous prime is 2121199299553. The next prime is 2121199299701. The reversal of 2121199299617 is 7169929911212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2119109072656 + 2090226961 = 1455716^2 + 45719^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121199299617 - 2⁶ = 2121199299553 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121199299217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060599649808 + 1060599649809.

It is an arithmetic number, because the mean of its divisors is an integer number (1060599649809).

Almost surely, 2^{2121199299617} is an apocalyptic number.

It is an amenable number.

2121199299617 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121199299617 is an equidigital number, since it uses as much as digits as its factorization.

2121199299617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2204496, while the sum is 59.

The spelling of 2121199299617 in words is "two trillion, one hundred twenty-one billion, one hundred ninety-nine million, two hundred ninety-nine thousand, six hundred seventeen".