123011211210 has 128 divisors (see below), whose sum is σ = 305751283200. Its totient is φ = 31649688576.

The previous prime is 123011211199. The next prime is 123011211227. The reversal of 123011211210 is 12112110321.

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 123011211210.

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 63 ways as a sum of consecutive naturals, for example, 82391224 + ... + 82392716.

It is an arithmetic number, because the mean of its divisors is an integer number (2388681900).

Almost surely, 2^123011211210 is an apocalyptic number.

123011211210 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 123011211210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152875641600).

123011211210 is an abundant number, since it is smaller than the sum of its proper divisors (182740071990).

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

123011211210 is a wasteful number, since it uses less digits than its factorization.

123011211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 123011211210 its reverse (12112110321), we get a palindrome (135123321531).

The spelling of 123011211210 in words is "one hundred twenty-three billion, eleven million, two hundred eleven thousand, two hundred ten".