123211212440 has 64 divisors (see below), whose sum is σ = 290439336960. Its totient is φ = 46982770560.

The previous prime is 123211212427. The next prime is 123211212457. The reversal of 123211212440 is 44212112321.

123211212440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 658442 + ... + 824601.

It is an arithmetic number, because the mean of its divisors is an integer number (4538114640).

Almost surely, 2^123211212440 is an apocalyptic number.

123211212440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123211212440 is an abundant number, since it is smaller than the sum of its proper divisors (167228124520).

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

123211212440 is a wasteful number, since it uses less digits than its factorization.

123211212440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483152 (or 1483148 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 123211212440 its reverse (44212112321), we get a palindrome (167423324761).

The spelling of 123211212440 in words is "one hundred twenty-three billion, two hundred eleven million, two hundred twelve thousand, four hundred forty".