2213681738 has 4 divisors (see below), whose sum is σ = 3320522610. Its totient is φ = 1106840868.

The previous prime is 2213681731. The next prime is 2213681749. The reversal of 2213681738 is 8371863122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1712056129 + 501625609 = 41377^2 + 22397^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2213681695 and 2213681704.

It is not an unprimeable number, because it can be changed into a prime (2213681731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 553420433 + ... + 553420436.

Almost surely, 2^2213681738 is an apocalyptic number.

2213681738 is a deficient number, since it is larger than the sum of its proper divisors (1106840872).

2213681738 is a wasteful number, since it uses less digits than its factorization.

2213681738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106840871.

The product of its digits is 96768, while the sum is 41.

The square root of 2213681738 is about 47049.7793618631. The cubic root of 2213681738 is about 1303.2819909146.

The spelling of 2213681738 in words is "two billion, two hundred thirteen million, six hundred eighty-one thousand, seven hundred thirty-eight".