123265206221 has 2 divisors, whose sum is σ = 123265206222. Its totient is φ = 123265206220.

The previous prime is 123265206209. The next prime is 123265206241. The reversal of 123265206221 is 122602562321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99928060996 + 23337145225 = 316114^2 + 152765^2 .

It is a cyclic number.

It is not a de Polignac number, because 123265206221 - 2²² = 123261011917 is a prime.

It is a super-2 number, since 2×123265206221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123265206241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61632603110 + 61632603111.

It is an arithmetic number, because the mean of its divisors is an integer number (61632603111).

Almost surely, 2^123265206221 is an apocalyptic number.

It is an amenable number.

123265206221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123265206221 is an equidigital number, since it uses as much as digits as its factorization.

123265206221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 123265206221 its reverse (122602562321), we get a palindrome (245867768542).

The spelling of 123265206221 in words is "one hundred twenty-three billion, two hundred sixty-five million, two hundred six thousand, two hundred twenty-one".