2121552 has 50 divisors (see below), whose sum is σ = 6144138. Its totient is φ = 706752.

The previous prime is 2121529. The next prime is 2121569. The reversal of 2121552 is 2551212.

It can be written as a sum of positive squares in only one way, i.e., 1245456 + 876096 = 1116^2 + 936^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 478 + ... + 2114.

2^2121552 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 2121552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3072069).

2121552 is an abundant number, since it is smaller than the sum of its proper divisors (4022586).

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

2121552 is a wasteful number, since it uses less digits than its factorization.

2121552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657 (or 1642 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 2121552 is about 1456.5548393384. The cubic root of 2121552 is about 128.4945063688.

Adding to 2121552 its reverse (2551212), we get a palindrome (4672764).

It can be divided in two parts, 212 and 1552, that added together give a square (1764 = 42²).

The spelling of 2121552 in words is "two million, one hundred twenty-one thousand, five hundred fifty-two".