2121231120 has 160 divisors (see below), whose sum is σ = 6893558784. Its totient is φ = 538560000.

The previous prime is 2121231059. The next prime is 2121231121. The reversal of 2121231120 is 211321212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2121231120.

It is not an unprimeable number, because it can be changed into a prime (2121231121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1384755 + ... + 1386285.

Almost surely, 2^2121231120 is an apocalyptic number.

2121231120 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 2121231120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3446779392).

2121231120 is an abundant number, since it is smaller than the sum of its proper divisors (4772327664).

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

2121231120 is a wasteful number, since it uses less digits than its factorization.

2121231120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821 (or 1815 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2121231120 is about 46056.8249014193. The cubic root of 2121231120 is about 1284.8802787319.

Adding to 2121231120 its reverse (211321212), we get a palindrome (2332552332).

The spelling of 2121231120 in words is "two billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred twenty".