2121203340 has 144 divisors (see below), whose sum is σ = 6700276128. Its totient is φ = 542702592.

The previous prime is 2121203333. The next prime is 2121203353. The reversal of 2121203340 is 433021212.

2121203340 is a `hidden beast` number, since 2 + 121 + 203 + 340 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 483999 + ... + 488361.

Almost surely, 2^2121203340 is an apocalyptic number.

2121203340 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 2121203340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3350138064).

2121203340 is an abundant number, since it is smaller than the sum of its proper divisors (4579072788).

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

2121203340 is a wasteful number, since it uses less digits than its factorization.

2121203340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4488 (or 4483 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2121203340 is about 46056.5233164641. The cubic root of 2121203340 is about 1284.8746697046.

Adding to 2121203340 its reverse (433021212), we get a palindrome (2554224552).

The spelling of 2121203340 in words is "two billion, one hundred twenty-one million, two hundred three thousand, three hundred forty".