2120551 has 2 divisors, whose sum is σ = 2120552.
Its totient is φ = 2120550.
The previous prime is 2120549. The next prime is 2120579. The reversal of 2120551 is 1550212.
2120551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 2120551 - 21 = 2120549 is a prime.
Together with 2120549, it forms a pair of twin primes.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2120051) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060275 + 1060276.
It is an arithmetic number, because the mean of its divisors is an integer number (1060276).
22120551 is an apocalyptic number.
2120551 is a deficient number, since it is larger than the sum of its proper divisors (1).
2120551 is an equidigital number, since it uses as much as digits as its factorization.
2120551 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 100, while the sum is 16.
The square root of 2120551 is about 1456.2111797401.
The cubic root of 2120551 is about 128.4742942418.
Adding to 2120551 its reverse (1550212), we get a palindrome (3670763).
The spelling of 2120551 in words is "two million, one hundred twenty thousand, five hundred fifty-one".