21418181333 has 16 divisors (see below), whose sum is σ = 22392002880. Its totient is φ = 20460537216.

The previous prime is 21418181287. The next prime is 21418181353. The reversal of 21418181333 is 33318181412.

It is a cyclic number.

It is not a de Polignac number, because 21418181333 - 2¹⁰ = 21418180309 is a prime.

It is a super-2 number, since 2×21418181333² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21418181293 and 21418181302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21418181353) 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, 2736041 + ... + 2743857.

It is an arithmetic number, because the mean of its divisors is an integer number (1399500180).

Almost surely, 2^21418181333 is an apocalyptic number.

It is an amenable number.

21418181333 is a deficient number, since it is larger than the sum of its proper divisors (973821547).

21418181333 is a wasteful number, since it uses less digits than its factorization.

21418181333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8836.

The product of its digits is 13824, while the sum is 35.

The spelling of 21418181333 in words is "twenty-one billion, four hundred eighteen million, one hundred eighty-one thousand, three hundred thirty-three".