21113344206 has 24 divisors (see below), whose sum is σ = 45751862520. Its totient is φ = 7036814736.

The previous prime is 21113344181. The next prime is 21113344249. The reversal of 21113344206 is 60244331112.

It is a happy number.

21113344206 is a `hidden beast` number, since 2 + 1 + 113 + 344 + 206 = 666.

It is a super-2 number, since 2×21113344206² (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 21113344206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60840 + ... + 214308.

It is an arithmetic number, because the mean of its divisors is an integer number (1906327605).

Almost surely, 2^21113344206 is an apocalyptic number.

21113344206 is an abundant number, since it is smaller than the sum of its proper divisors (24638518314).

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

21113344206 is a wasteful number, since it uses less digits than its factorization.

21113344206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161120 (or 161117 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21113344206 its reverse (60244331112), we get a palindrome (81357675318).

The spelling of 21113344206 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-four thousand, two hundred six".