212210100 has 54 divisors (see below), whose sum is σ = 665163590. Its totient is φ = 56589120.

The previous prime is 212210093. The next prime is 212210111. The reversal of 212210100 is 1012212.

It can be written as a sum of positive squares in 3 ways, for example, as 56160036 + 156050064 = 7494^2 + 12492^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 116995 + ... + 118794.

Almost surely, 2^212210100 is an apocalyptic number.

212210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212210100 is an abundant number, since it is smaller than the sum of its proper divisors (452953490).

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

212210100 is a wasteful number, since it uses less digits than its factorization.

212210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235809 (or 235799 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 212210100 is about 14567.4328555171. The cubic root of 212210100 is about 596.4701071524.

Adding to 212210100 its reverse (1012212), we get a palindrome (213222312).

The spelling of 212210100 in words is "two hundred twelve million, two hundred ten thousand, one hundred".