2123120251 has 8 divisors (see below), whose sum is σ = 2467549440. Its totient is φ = 1788972648.

The previous prime is 2123120243. The next prime is 2123120309. The reversal of 2123120251 is 1520213212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2123120251 - 2³ = 2123120243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123120201) 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, 2569951 + ... + 2570776.

It is an arithmetic number, because the mean of its divisors is an integer number (308443680).

Almost surely, 2^2123120251 is an apocalyptic number.

2123120251 is a deficient number, since it is larger than the sum of its proper divisors (344429189).

2123120251 is an equidigital number, since it uses as much as digits as its factorization.

2123120251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5140793.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2123120251 is about 46077.3290350038. The cubic root of 2123120251 is about 1285.2615961230.

Adding to 2123120251 its reverse (1520213212), we get a palindrome (3643333463).

The spelling of 2123120251 in words is "two billion, one hundred twenty-three million, one hundred twenty thousand, two hundred fifty-one".