200123534300021 has 4 divisors (see below), whose sum is σ = 200124062071200. Its totient is φ = 200123006528844.

The previous prime is 200123534299981. The next prime is 200123534300033. The reversal of 200123534300021 is 120003435321002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 200123534300021 - 2³⁸ = 199848656393077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200123534200021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263316401 + ... + 264075318.

It is an arithmetic number, because the mean of its divisors is an integer number (50031015517800).

Almost surely, 2^{200123534300021} is an apocalyptic number.

It is an amenable number.

200123534300021 is a deficient number, since it is larger than the sum of its proper divisors (527771179).

200123534300021 is an equidigital number, since it uses as much as digits as its factorization.

200123534300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527771178.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 200123534300021 its reverse (120003435321002), we get a palindrome (320126969621023).

The spelling of 200123534300021 in words is "two hundred trillion, one hundred twenty-three billion, five hundred thirty-four million, three hundred thousand, twenty-one".