21893181338 has 32 divisors (see below), whose sum is σ = 39515299200. Its totient is φ = 8886979584.

The previous prime is 21893181307. The next prime is 21893181341. The reversal of 21893181338 is 83318139812.

It is a super-2 number, since 2×21893181338² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21893181292 and 21893181301.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2074058 + ... + 2084586.

It is an arithmetic number, because the mean of its divisors is an integer number (1234853100).

Almost surely, 2^21893181338 is an apocalyptic number.

21893181338 is a deficient number, since it is larger than the sum of its proper divisors (17622117862).

21893181338 is a wasteful number, since it uses less digits than its factorization.

21893181338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18374.

The product of its digits is 248832, while the sum is 47.

The spelling of 21893181338 in words is "twenty-one billion, eight hundred ninety-three million, one hundred eighty-one thousand, three hundred thirty-eight".