21113330645 has 8 divisors (see below), whose sum is σ = 27639269280. Its totient is φ = 15355149520.

The previous prime is 21113330639. The next prime is 21113330663. The reversal of 21113330645 is 54603331112.

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

It is a de Polignac number, because none of the positive numbers 2^k-21113330645 is a prime.

It is a super-2 number, since 2×21113330645² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191939315 + ... + 191939424.

It is an arithmetic number, because the mean of its divisors is an integer number (3454908660).

Almost surely, 2^21113330645 is an apocalyptic number.

It is an amenable number.

21113330645 is a deficient number, since it is larger than the sum of its proper divisors (6525938635).

21113330645 is a wasteful number, since it uses less digits than its factorization.

21113330645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383878755.

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 21113330645 its reverse (54603331112), we get a palindrome (75716661757).

The spelling of 21113330645 in words is "twenty-one billion, one hundred thirteen million, three hundred thirty thousand, six hundred forty-five".