212043440 has 160 divisors (see below), whose sum is σ = 597390336. Its totient is φ = 68428800.

The previous prime is 212043427. The next prime is 212043451. The reversal of 212043440 is 44340212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1300799 + ... + 1300961.

Almost surely, 2^212043440 is an apocalyptic number.

212043440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212043440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (298695168).

212043440 is an abundant number, since it is smaller than the sum of its proper divisors (385346896).

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

212043440 is a wasteful number, since it uses less digits than its factorization.

212043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 301 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 212043440 is about 14561.7114378771. The cubic root of 212043440 is about 596.3139195773.

Adding to 212043440 its reverse (44340212), we get a palindrome (256383652).

The spelling of 212043440 in words is "two hundred twelve million, forty-three thousand, four hundred forty".