210113300123021 has 4 divisors (see below), whose sum is σ = 210113329994844. Its totient is φ = 210113270251200.

The previous prime is 210113300123009. The next prime is 210113300123071. The reversal of 210113300123021 is 120321003311012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 161857909630921 + 48255390492100 = 12722339^2 + 6946610^2 .

It is a cyclic number.

It is not a de Polignac number, because 210113300123021 - 2³⁸ = 209838422216077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210113300122984 and 210113300123002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210113300123071) 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, 2066261 + ... + 20603301.

It is an arithmetic number, because the mean of its divisors is an integer number (52528332498711).

Almost surely, 2^{210113300123021} is an apocalyptic number.

It is an amenable number.

210113300123021 is a deficient number, since it is larger than the sum of its proper divisors (29871823).

210113300123021 is a wasteful number, since it uses less digits than its factorization.

210113300123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29871822.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 210113300123021 its reverse (120321003311012), we get a palindrome (330434303434033).

The spelling of 210113300123021 in words is "two hundred ten trillion, one hundred thirteen billion, three hundred million, one hundred twenty-three thousand, twenty-one".