212231700 has 54 divisors (see below), whose sum is σ = 665231294. Its totient is φ = 56594880.

The previous prime is 212231693. The next prime is 212231707. The reversal of 212231700 is 7132212.

It is an interprime number because it is at equal distance from previous prime (212231693) and next prime (212231707).

It can be written as a sum of positive squares in 3 ways, for example, as 1052676 + 211179024 = 1026^2 + 14532^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212231707) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 117007 + ... + 118806.

Almost surely, 2^212231700 is an apocalyptic number.

212231700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212231700 is an abundant number, since it is smaller than the sum of its proper divisors (452999594).

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

212231700 is a wasteful number, since it uses less digits than its factorization.

212231700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235833 (or 235823 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 212231700 is about 14568.1742164212. The cubic root of 212231700 is about 596.4903438852.

Adding to 212231700 its reverse (7132212), we get a palindrome (219363912).

The spelling of 212231700 in words is "two hundred twelve million, two hundred thirty-one thousand, seven hundred".