2121449880 has 128 divisors (see below), whose sum is σ = 7112448000. Its totient is φ = 501734400.

The previous prime is 2121449851. The next prime is 2121449881. The reversal of 2121449880 is 889441212.

2121449880 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121449881) 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, 34521 + ... + 73719.

It is an arithmetic number, because the mean of its divisors is an integer number (55566000).

Almost surely, 2^2121449880 is an apocalyptic number.

2121449880 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 2121449880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3556224000).

2121449880 is an abundant number, since it is smaller than the sum of its proper divisors (4990998120).

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

2121449880 is a wasteful number, since it uses less digits than its factorization.

2121449880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39265 (or 39261 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 2121449880 is about 46059.1997325181. The cubic root of 2121449880 is about 1284.9244465967.

The spelling of 2121449880 in words is "two billion, one hundred twenty-one million, four hundred forty-nine thousand, eight hundred eighty".