212123420 has 12 divisors (see below), whose sum is σ = 445459224. Its totient is φ = 84849360.

The previous prime is 212123419. The next prime is 212123491. The reversal of 212123420 is 24321212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5303066 + ... + 5303105.

It is an arithmetic number, because the mean of its divisors is an integer number (37121602).

Almost surely, 2^212123420 is an apocalyptic number.

212123420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212123420 is an abundant number, since it is smaller than the sum of its proper divisors (233335804).

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

212123420 is a wasteful number, since it uses less digits than its factorization.

212123420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606180 (or 10606178 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 212123420 is about 14564.4574220944. The cubic root of 212123420 is about 596.3888840785.

Adding to 212123420 its reverse (24321212), we get a palindrome (236444632).

The spelling of 212123420 in words is "two hundred twelve million, one hundred twenty-three thousand, four hundred twenty".