21535274194 has 8 divisors (see below), whose sum is σ = 36917612928. Its totient is φ = 9229403220.

The previous prime is 21535274183. The next prime is 21535274213. The reversal of 21535274194 is 49147253512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21535274194² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21535274194.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769116922 + ... + 769116949.

It is an arithmetic number, because the mean of its divisors is an integer number (4614701616).

Almost surely, 2^21535274194 is an apocalyptic number.

21535274194 is a deficient number, since it is larger than the sum of its proper divisors (15382338734).

21535274194 is a wasteful number, since it uses less digits than its factorization.

21535274194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538233880.

The product of its digits is 302400, while the sum is 43.

The spelling of 21535274194 in words is "twenty-one billion, five hundred thirty-five million, two hundred seventy-four thousand, one hundred ninety-four".