2120553 has 8 divisors (see below), whose sum is σ = 3141600.
Its totient is φ = 1413684.
The previous prime is 2120551. The next prime is 2120579. The reversal of 2120553 is 3550212.
It is a happy number.
It is not a de Polignac number, because 2120553 - 21 = 2120551 is a prime.
It is not an unprimeable number, because it can be changed into a prime (2120551) 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, 39243 + ... + 39296.
It is an arithmetic number, because the mean of its divisors is an integer number (392700).
22120553 is an apocalyptic number.
It is an amenable number.
2120553 is a deficient number, since it is larger than the sum of its proper divisors (1021047).
2120553 is an equidigital number, since it uses as much as digits as its factorization.
2120553 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 78548 (or 78542 counting only the distinct ones).
The product of its (nonzero) digits is 300, while the sum is 18.
The square root of 2120553 is about 1456.2118664535.
The cubic root of 2120553 is about 128.4743346320.
Adding to 2120553 its reverse (3550212), we get a palindrome (5670765).
The spelling of 2120553 in words is "two million, one hundred twenty thousand, five hundred fifty-three".