212222420 has 48 divisors (see below), whose sum is σ = 454077120. Its totient is φ = 83303424.

The previous prime is 212222401. The next prime is 212222429. The reversal of 212222420 is 24222212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222429) 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, 269267 + ... + 270053.

It is an arithmetic number, because the mean of its divisors is an integer number (9459940).

Almost surely, 2^212222420 is an apocalyptic number.

212222420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212222420 is an abundant number, since it is smaller than the sum of its proper divisors (241854700).

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

212222420 is a wasteful number, since it uses less digits than its factorization.

212222420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032 (or 1030 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 212222420 is about 14567.8557104332. The cubic root of 212222420 is about 596.4816497534.

Adding to 212222420 its reverse (24222212), we get a palindrome (236444632).

It can be divided in two parts, 2122 and 22420, that added together give a palindrome (24542).

The spelling of 212222420 in words is "two hundred twelve million, two hundred twenty-two thousand, four hundred twenty".