212212123420 has 48 divisors (see below), whose sum is σ = 488601792000. Its totient is φ = 76780249920.

The previous prime is 212212123399. The next prime is 212212123427. The reversal of 212212123420 is 24321212212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 212212123391 and 212212123400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212212123427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2379840 + ... + 2467399.

It is an arithmetic number, because the mean of its divisors is an integer number (10179204000).

Almost surely, 2^212212123420 is an apocalyptic number.

212212123420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212212123420 is an abundant number, since it is smaller than the sum of its proper divisors (276389668580).

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

212212123420 is a wasteful number, since it uses less digits than its factorization.

212212123420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4847458 (or 4847456 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 212212123420 its reverse (24321212212), we get a palindrome (236533335632).

The spelling of 212212123420 in words is "two hundred twelve billion, two hundred twelve million, one hundred twenty-three thousand, four hundred twenty".