2123420551 has 4 divisors (see below), whose sum is σ = 2426766352. Its totient is φ = 1820074752.

The previous prime is 2123420549. The next prime is 2123420597. The reversal of 2123420551 is 1550243212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2123420551 - 2¹ = 2123420549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123420521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151672890 + ... + 151672903.

It is an arithmetic number, because the mean of its divisors is an integer number (606691588).

Almost surely, 2^2123420551 is an apocalyptic number.

2123420551 is a deficient number, since it is larger than the sum of its proper divisors (303345801).

2123420551 is an equidigital number, since it uses as much as digits as its factorization.

2123420551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303345800.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 2123420551 is about 46080.5875722088. The cubic root of 2123420551 is about 1285.3221902511.

Adding to 2123420551 its reverse (1550243212), we get a palindrome (3673663763).

The spelling of 2123420551 in words is "two billion, one hundred twenty-three million, four hundred twenty thousand, five hundred fifty-one".