2121199955683 has 2 divisors, whose sum is σ = 2121199955684. Its totient is φ = 2121199955682.

The previous prime is 2121199955587. The next prime is 2121199955687. The reversal of 2121199955683 is 3865599911212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121199955683 is a prime.

It is a super-2 number, since 2×2121199955683² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2121199955687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060599977841 + 1060599977842.

It is an arithmetic number, because the mean of its divisors is an integer number (1060599977842).

Almost surely, 2^{2121199955683} is an apocalyptic number.

2121199955683 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121199955683 is an equidigital number, since it uses as much as digits as its factorization.

2121199955683 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10497600, while the sum is 61.

The spelling of 2121199955683 in words is "two trillion, one hundred twenty-one billion, one hundred ninety-nine million, nine hundred fifty-five thousand, six hundred eighty-three".