212222100420 has 72 divisors (see below), whose sum is σ = 702262229760. Its totient is φ = 51447781440.

The previous prime is 212222100401. The next prime is 212222100437. The reversal of 212222100420 is 24001222212.

212222100420 is a `hidden beast` number, since 2 + 1 + 22 + 221 + 0 + 0 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 212222100393 and 212222100402.

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 23 ways as a sum of consecutive naturals, for example, 53589460 + ... + 53593419.

It is an arithmetic number, because the mean of its divisors is an integer number (9753642080).

Almost surely, 2^212222100420 is an apocalyptic number.

212222100420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212222100420 is an abundant number, since it is smaller than the sum of its proper divisors (490040129340).

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

212222100420 is a wasteful number, since it uses less digits than its factorization.

212222100420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107182905 (or 107182900 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 212222100420 its reverse (24001222212), we get a palindrome (236223322632).

The spelling of 212222100420 in words is "two hundred twelve billion, two hundred twenty-two million, one hundred thousand, four hundred twenty".