123121112210 has 32 divisors (see below), whose sum is σ = 222228120240. Its totient is φ = 49112967168.

The previous prime is 123121112207. The next prime is 123121112221. The reversal of 123121112210 is 12211121321.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 87653299969 + 35467812241 = 296063^2 + 188329^2 .

It is a super-2 number, since 2×123121112210² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12781676 + ... + 12791304.

Almost surely, 2^123121112210 is an apocalyptic number.

123121112210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123121112210 is a deficient number, since it is larger than the sum of its proper divisors (99107008030).

123121112210 is a wasteful number, since it uses less digits than its factorization.

123121112210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13022.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 123121112210 its reverse (12211121321), we get a palindrome (135332233531).

It can be divided in two parts, 1231211 and 12210, that added together give a palindrome (1243421).

The spelling of 123121112210 in words is "one hundred twenty-three billion, one hundred twenty-one million, one hundred twelve thousand, two hundred ten".