2121362256 has 80 divisors (see below), whose sum is σ = 5937369984. Its totient is φ = 648786432.

The previous prime is 2121362239. The next prime is 2121362297. The reversal of 2121362256 is 6522631212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94030 + ... + 114386.

Almost surely, 2^2121362256 is an apocalyptic number.

2121362256 is a gapful number since it is divisible by the number (26) 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 2121362256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2968684992).

2121362256 is an abundant number, since it is smaller than the sum of its proper divisors (3816007728).

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

2121362256 is a wasteful number, since it uses less digits than its factorization.

2121362256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20548 (or 20542 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 2121362256 is about 46058.2485120744. The cubic root of 2121362256 is about 1284.9067555872.

Adding to 2121362256 its reverse (6522631212), we get a palindrome (8643993468).

The spelling of 2121362256 in words is "two billion, one hundred twenty-one million, three hundred sixty-two thousand, two hundred fifty-six".