210121300123 has 8 divisors (see below), whose sum is σ = 250579438848. Its totient is φ = 172273363944.

The previous prime is 210121300091. The next prime is 210121300133. The reversal of 210121300123 is 321003121012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210121300123 - 2⁵ = 210121300091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210121300097 and 210121300106.

It is not an unprimeable number, because it can be changed into a prime (210121300133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 652550461 + ... + 652550782.

It is an arithmetic number, because the mean of its divisors is an integer number (31322429856).

Almost surely, 2^210121300123 is an apocalyptic number.

210121300123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

210121300123 is a deficient number, since it is larger than the sum of its proper divisors (40458138725).

210121300123 is a wasteful number, since it uses less digits than its factorization.

210121300123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305101273.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 210121300123 its reverse (321003121012), we get a palindrome (531124421135).

The spelling of 210121300123 in words is "two hundred ten billion, one hundred twenty-one million, three hundred thousand, one hundred twenty-three".