999500053106021 has 2 divisors, whose sum is σ = 999500053106022. Its totient is φ = 999500053106020.

The previous prime is 999500053105979. The next prime is 999500053106033. The reversal of 999500053106021 is 120601350005999.

999500053106021 = 22355089² + 22355090².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 499750048908100 + 499750004197921 = 22355090^2 + 22355089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999500053106021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999500053156021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499750026553010 + 499750026553011.

It is an arithmetic number, because the mean of its divisors is an integer number (499750026553011).

Almost surely, 2^{999500053106021} is an apocalyptic number.

999500053106021 is the 22355090-th centered square number.

It is an amenable number.

999500053106021 is a deficient number, since it is larger than the sum of its proper divisors (1).

999500053106021 is an equidigital number, since it uses as much as digits as its factorization.

999500053106021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 656100, while the sum is 50.

The spelling of 999500053106021 in words is "nine hundred ninety-nine trillion, five hundred billion, fifty-three million, one hundred six thousand, twenty-one".