2143121420 has 96 divisors (see below), whose sum is σ = 4999712256. Its totient is φ = 765158400.

The previous prime is 2143121417. The next prime is 2143121441. The reversal of 2143121420 is 241213412.

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

It is a junction number, because it is equal to n+sod(n) for n = 2143121392 and 2143121401.

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, 4400417 + ... + 4400903.

It is an arithmetic number, because the mean of its divisors is an integer number (52080336).

Almost surely, 2^2143121420 is an apocalyptic number.

2143121420 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 2143121420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2499856128).

2143121420 is an abundant number, since it is smaller than the sum of its proper divisors (2856590836).

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

2143121420 is a wasteful number, since it uses less digits than its factorization.

2143121420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831 (or 829 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 2143121420 is about 46293.8594200138. The cubic root of 2143121420 is about 1289.2849872512.

Adding to 2143121420 its reverse (241213412), we get a palindrome (2384334832).

The spelling of 2143121420 in words is "two billion, one hundred forty-three million, one hundred twenty-one thousand, four hundred twenty".