123212220101 has 4 divisors (see below), whose sum is σ = 130459997772. Its totient is φ = 115964442432.

The previous prime is 123212220083. The next prime is 123212220107. The reversal of 123212220101 is 101022212321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77283444001 + 45928776100 = 277999^2 + 214310^2 .

It is a cyclic number.

It is not a de Polignac number, because 123212220101 - 2³⁴ = 106032350917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 7247777653 = 123212220101 / (1 + 2 + 3 + 2 + 1 + 2 + 2 + 2 + 0 + 1 + 0 + 1).

It is a self number, because there is not a number n which added to its sum of digits gives 123212220101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123212220107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3623888810 + ... + 3623888843.

It is an arithmetic number, because the mean of its divisors is an integer number (32614999443).

Almost surely, 2^123212220101 is an apocalyptic number.

It is an amenable number.

123212220101 is a deficient number, since it is larger than the sum of its proper divisors (7247777671).

123212220101 is an equidigital number, since it uses as much as digits as its factorization.

123212220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7247777670.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 123212220101 its reverse (101022212321), we get a palindrome (224234432422).

It can be divided in two parts, 123212220 and 101, that added together give a palindrome (123212321).

The spelling of 123212220101 in words is "one hundred twenty-three billion, two hundred twelve million, two hundred twenty thousand, one hundred one".