2123400287 has 2 divisors, whose sum is σ = 2123400288. Its totient is φ = 2123400286.

The previous prime is 2123400277. The next prime is 2123400313. The reversal of 2123400287 is 7820043212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2123400287 - 2⁸ = 2123400031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123400277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061700143 + 1061700144.

It is an arithmetic number, because the mean of its divisors is an integer number (1061700144).

Almost surely, 2^2123400287 is an apocalyptic number.

2123400287 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123400287 is an equidigital number, since it uses as much as digits as its factorization.

2123400287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 2123400287 is about 46080.3676960156. The cubic root of 2123400287 is about 1285.3181015884.

Adding to 2123400287 its reverse (7820043212), we get a palindrome (9943443499).

The spelling of 2123400287 in words is "two billion, one hundred twenty-three million, four hundred thousand, two hundred eighty-seven".