123210211021 has 2 divisors, whose sum is σ = 123210211022. Its totient is φ = 123210211020.

The previous prime is 123210210961. The next prime is 123210211051. The reversal of 123210211021 is 120112012321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116451562500 + 6758648521 = 341250^2 + 82211^2 .

It is a cyclic number.

It is not a de Polignac number, because 123210211021 - 2²³ = 123201822413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123210210986 and 123210211004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123210211051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61605105510 + 61605105511.

It is an arithmetic number, because the mean of its divisors is an integer number (61605105511).

Almost surely, 2^123210211021 is an apocalyptic number.

It is an amenable number.

123210211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123210211021 is an equidigital number, since it uses as much as digits as its factorization.

123210211021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 123210211021 its reverse (120112012321), we get a palindrome (243322223342).

The spelling of 123210211021 in words is "one hundred twenty-three billion, two hundred ten million, two hundred eleven thousand, twenty-one".