12123012210 has 128 divisors (see below), whose sum is σ = 30801199104. Its totient is φ = 3049159680.

The previous prime is 12123012191. The next prime is 12123012211. The reversal of 12123012210 is 1221032121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12123012210.

It is not an unprimeable number, because it can be changed into a prime (12123012211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14729859 + ... + 14730681.

It is an arithmetic number, because the mean of its divisors is an integer number (240634368).

Almost surely, 2^12123012210 is an apocalyptic number.

12123012210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12123012210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15400599552).

12123012210 is an abundant number, since it is smaller than the sum of its proper divisors (18678186894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12123012210 is a wasteful number, since it uses less digits than its factorization.

12123012210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12123012210 its reverse (1221032121), we get a palindrome (13344044331).

The spelling of 12123012210 in words is "twelve billion, one hundred twenty-three million, twelve thousand, two hundred ten".