2138243811 has 16 divisors (see below), whose sum is σ = 3132554880. Its totient is φ = 1286579520.

The previous prime is 2138243791. The next prime is 2138243837. The reversal of 2138243811 is 1183428312.

It is not a de Polignac number, because 2138243811 - 2⁷ = 2138243683 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (2138243851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228490 + ... + 237663.

It is an arithmetic number, because the mean of its divisors is an integer number (195784680).

Almost surely, 2^2138243811 is an apocalyptic number.

2138243811 is a deficient number, since it is larger than the sum of its proper divisors (994311069).

2138243811 is a wasteful number, since it uses less digits than its factorization.

2138243811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466306.

The product of its digits is 9216, while the sum is 33.

The square root of 2138243811 is about 46241.1484610839. The cubic root of 2138243811 is about 1288.3061338709.

The spelling of 2138243811 in words is "two billion, one hundred thirty-eight million, two hundred forty-three thousand, eight hundred eleven".