212112121340 has 96 divisors (see below), whose sum is σ = 539276398080. Its totient is φ = 68457602304.

The previous prime is 212112121337. The next prime is 212112121363. The reversal of 212112121340 is 43121211212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 163667 + ... + 671573.

It is an arithmetic number, because the mean of its divisors is an integer number (5617462480).

Almost surely, 2^212112121340 is an apocalyptic number.

212112121340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212112121340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269638199040).

212112121340 is an abundant number, since it is smaller than the sum of its proper divisors (327164276740).

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

212112121340 is a wasteful number, since it uses less digits than its factorization.

212112121340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508099 (or 508097 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 212112121340 its reverse (43121211212), we get a palindrome (255233332552).

The spelling of 212112121340 in words is "two hundred twelve billion, one hundred twelve million, one hundred twenty-one thousand, three hundred forty".