2123851 has 2 divisors, whose sum is σ = 2123852. Its totient is φ = 2123850.

The previous prime is 2123831. The next prime is 2123867. The reversal of 2123851 is 1583212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2123851 - 2¹¹ = 2121803 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2123831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061925 + 1061926.

It is an arithmetic number, because the mean of its divisors is an integer number (1061926).

2^2123851 is an apocalyptic number.

2123851 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123851 is an equidigital number, since it uses as much as digits as its factorization.

2123851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 22.

The square root of 2123851 is about 1457.3438166747. The cubic root of 2123851 is about 128.5409035706.

The spelling of 2123851 in words is "two million, one hundred twenty-three thousand, eight hundred fifty-one".