123121320520210 has 32 divisors (see below), whose sum is σ = 225252945089712. Its totient is φ = 48440857006080.

The previous prime is 123121320520207. The next prime is 123121320520279. The reversal of 123121320520210 is 12025023121321.

It can be written as a sum of positive squares in 8 ways, for example, as 3473754167601 + 119647566352609 = 1863801^2 + 10938353^2 .

It is a super-4 number, since 4×123121320520210⁴ (a number of 57 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106414342 + ... + 107565118.

Almost surely, 2^{123121320520210} is an apocalyptic number.

123121320520210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123121320520210 is a deficient number, since it is larger than the sum of its proper divisors (102131624569502).

123121320520210 is a wasteful number, since it uses less digits than its factorization.

123121320520210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326238.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 123121320520210 its reverse (12025023121321), we get a palindrome (135146343641531).

The spelling of 123121320520210 in words is "one hundred twenty-three trillion, one hundred twenty-one billion, three hundred twenty million, five hundred twenty thousand, two hundred ten".