2143212243220 has 72 divisors (see below), whose sum is σ = 4776341032008. Its totient is φ = 807677049600.

The previous prime is 2143212243217. The next prime is 2143212243223. The reversal of 2143212243220 is 223422123412.

It is an interprime number because it is at equal distance from previous prime (2143212243217) and next prime (2143212243223).

It can be written as a sum of positive squares in 4 ways, for example, as 143765338896 + 1999446904324 = 379164^2 + 1414018^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143212243223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 486810 + ... + 2126830.

It is an arithmetic number, because the mean of its divisors is an integer number (66338069889).

Almost surely, 2^{2143212243220} is an apocalyptic number.

2143212243220 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 2143212243220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2388170516004).

2143212243220 is an abundant number, since it is smaller than the sum of its proper divisors (2633128788788).

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

2143212243220 is a wasteful number, since it uses less digits than its factorization.

2143212243220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640249 (or 1640228 counting only the distinct ones).

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

Adding to 2143212243220 its reverse (223422123412), we get a palindrome (2366634366632).

The spelling of 2143212243220 in words is "two trillion, one hundred forty-three billion, two hundred twelve million, two hundred forty-three thousand, two hundred twenty".