2121372 has 54 divisors (see below), whose sum is σ = 5906264. Its totient is φ = 641520.

The previous prime is 2121367. The next prime is 2121373. The reversal of 2121372 is 2731212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121373) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4113 + ... + 4599.

2^2121372 is an apocalyptic number.

2121372 is a gapful number since it is divisible by the number (22) 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 2121372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2953132).

2121372 is an abundant number, since it is smaller than the sum of its proper divisors (3784892).

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

2121372 is a wasteful number, since it uses less digits than its factorization.

2121372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 503 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 2121372 is about 1456.4930483871. The cubic root of 2121372 is about 128.4908722894.

Adding to 2121372 its reverse (2731212), we get a palindrome (4852584).

The spelling of 2121372 in words is "two million, one hundred twenty-one thousand, three hundred seventy-two".