2121625324 has 90 divisors (see below), whose sum is σ = 4691274420. Its totient is φ = 837109728.

The previous prime is 2121625321. The next prime is 2121625361. The reversal of 2121625324 is 4235261212.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 2121625292 and 2121625301.

It is not an unprimeable number, because it can be changed into a prime (2121625321) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 5597767 + ... + 5598145.

Almost surely, 2^2121625324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121625324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2345637210).

2121625324 is an abundant number, since it is smaller than the sum of its proper divisors (2569649096).

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

2121625324 is an equidigital number, since it uses as much as digits as its factorization.

2121625324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 401 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 2121625324 is about 46061.1042420826. The cubic root of 2121625324 is about 1284.9598667234.

Adding to 2121625324 its reverse (4235261212), we get a palindrome (6356886536).

The spelling of 2121625324 in words is "two billion, one hundred twenty-one million, six hundred twenty-five thousand, three hundred twenty-four".