212431043440 has 320 divisors, whose sum is σ = 627915525120. Its totient is φ = 64913080320.

The previous prime is 212431043423. The next prime is 212431043471. The reversal of 212431043440 is 44340134212.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 212431043399 and 212431043408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 209704374 + ... + 209705386.

It is an arithmetic number, because the mean of its divisors is an integer number (1962236016).

Almost surely, 2^212431043440 is an apocalyptic number.

212431043440 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 212431043440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313957762560).

212431043440 is an abundant number, since it is smaller than the sum of its proper divisors (415484481680).

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

212431043440 is a wasteful number, since it uses less digits than its factorization.

212431043440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680 (or 1674 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 212431043440 its reverse (44340134212), we get a palindrome (256771177652).

The spelling of 212431043440 in words is "two hundred twelve billion, four hundred thirty-one million, forty-three thousand, four hundred forty".