204123205019 has 2 divisors, whose sum is σ = 204123205020. Its totient is φ = 204123205018.

The previous prime is 204123205007. The next prime is 204123205063. The reversal of 204123205019 is 910502321402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204123205019 is a prime.

It is a super-2 number, since 2×204123205019² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 204123204982 and 204123205000.

It is not a weakly prime, because it can be changed into another prime (204123205219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102061602509 + 102061602510.

It is an arithmetic number, because the mean of its divisors is an integer number (102061602510).

Almost surely, 2^204123205019 is an apocalyptic number.

204123205019 is a deficient number, since it is larger than the sum of its proper divisors (1).

204123205019 is an equidigital number, since it uses as much as digits as its factorization.

204123205019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 204123205019 in words is "two hundred four billion, one hundred twenty-three million, two hundred five thousand, nineteen".