2138421751 has 2 divisors, whose sum is σ = 2138421752. Its totient is φ = 2138421750.

The previous prime is 2138421713. The next prime is 2138421787. The reversal of 2138421751 is 1571248312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138421751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138421151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069210875 + 1069210876.

It is an arithmetic number, because the mean of its divisors is an integer number (1069210876).

Almost surely, 2^2138421751 is an apocalyptic number.

2138421751 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138421751 is an equidigital number, since it uses as much as digits as its factorization.

2138421751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 2138421751 is about 46243.0724649650. The cubic root of 2138421751 is about 1288.3418695580.

The spelling of 2138421751 in words is "two billion, one hundred thirty-eight million, four hundred twenty-one thousand, seven hundred fifty-one".