2121544000 has 56 divisors (see below), whose sum is σ = 5254023528. Its totient is φ = 848614400.

The previous prime is 2121543929. The next prime is 2121544001. The reversal of 2121544000 is 4451212.

It can be written as a sum of positive squares in 4 ways, for example, as 506790144 + 1614753856 = 22512^2 + 40184^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121544001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124597 + ... + 140596.

Almost surely, 2^2121544000 is an apocalyptic number.

2121544000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121544000 is an abundant number, since it is smaller than the sum of its proper divisors (3132479528).

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

2121544000 is an equidigital number, since it uses as much as digits as its factorization.

2121544000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265220 (or 265200 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 2121544000 is about 46060.2214497499. The cubic root of 2121544000 is about 1284.9434485855.

Adding to 2121544000 its reverse (4451212), we get a palindrome (2125995212).

It can be divided in two parts, 2121 and 544000, that added together give a square (546121 = 739²).

The spelling of 2121544000 in words is "two billion, one hundred twenty-one million, five hundred forty-four thousand".