2123550 has 144 divisors (see below), whose sum is σ = 6926640. Its totient is φ = 475200.

The previous prime is 2123491. The next prime is 2123557. The reversal of 2123550 is 553212.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123557) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 163344 + ... + 163356.

2^2123550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2123550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3463320).

2123550 is an abundant number, since it is smaller than the sum of its proper divisors (4803090).

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

2123550 is a wasteful number, since it uses less digits than its factorization.

2123550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 2123550 is about 1457.2405429441. The cubic root of 2123550 is about 128.5348308533.

Adding to 2123550 its reverse (553212), we get a palindrome (2676762).

The spelling of 2123550 in words is "two million, one hundred twenty-three thousand, five hundred fifty".