212811380 has 12 divisors (see below), whose sum is σ = 446903940. Its totient is φ = 85124544.

The previous prime is 212811331. The next prime is 212811409. The reversal of 212811380 is 83118212.

It can be written as a sum of positive squares in 2 ways, for example, as 22316176 + 190495204 = 4724^2 + 13802^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 5320265 + ... + 5320304.

It is an arithmetic number, because the mean of its divisors is an integer number (37241995).

Almost surely, 2^212811380 is an apocalyptic number.

212811380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212811380 is an abundant number, since it is smaller than the sum of its proper divisors (234092560).

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

212811380 is a wasteful number, since it uses less digits than its factorization.

212811380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10640578 (or 10640576 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 212811380 is about 14588.0560733773. The cubic root of 212811380 is about 597.0329257102.

Adding to 212811380 its reverse (83118212), we get a palindrome (295929592).

The spelling of 212811380 in words is "two hundred twelve million, eight hundred eleven thousand, three hundred eighty".