212022100 has 18 divisors (see below), whose sum is σ = 460088174. Its totient is φ = 84808800.

The previous prime is 212022091. The next prime is 212022143. The reversal of 212022100 is 1220212.

It can be written as a sum of positive squares in 3 ways, for example, as 3392964 + 208629136 = 1842^2 + 14444^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1060011 + ... + 1060210.

Almost surely, 2^212022100 is an apocalyptic number.

212022100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212022100 is an abundant number, since it is smaller than the sum of its proper divisors (248066074).

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

212022100 is a wasteful number, since it uses less digits than its factorization.

212022100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120235 (or 2120228 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 212022100 is about 14560.9786758995. The cubic root of 212022100 is about 596.2939146105.

Adding to 212022100 its reverse (1220212), we get a palindrome (213242312).

The spelling of 212022100 in words is "two hundred twelve million, twenty-two thousand, one hundred".