213394209138 has 48 divisors (see below), whose sum is σ = 505217546496. Its totient is φ = 64558343520.

The previous prime is 213394209131. The next prime is 213394209233. The reversal of 213394209138 is 831902493312.

213394209138 is a `hidden beast` number, since 2 + 133 + 9 + 420 + 91 + 3 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 213394209093 and 213394209102.

It is not an unprimeable number, because it can be changed into a prime (213394209131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 767581 + ... + 1007952.

It is an arithmetic number, because the mean of its divisors is an integer number (10525365552).

Almost surely, 2^213394209138 is an apocalyptic number.

213394209138 is an abundant number, since it is smaller than the sum of its proper divisors (291823337358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213394209138 is a wasteful number, since it uses less digits than its factorization.

213394209138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776159 (or 1776156 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 213394209138 in words is "two hundred thirteen billion, three hundred ninety-four million, two hundred nine thousand, one hundred thirty-eight".