21113354215 has 8 divisors (see below), whose sum is σ = 26020782720. Its totient is φ = 16434178272.

The previous prime is 21113354209. The next prime is 21113354243. The reversal of 21113354215 is 51245331112.

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

It is a cyclic number.

It is not a de Polignac number, because 21113354215 - 2¹¹ = 21113352167 is a prime.

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, 57062935 + ... + 57063304.

It is an arithmetic number, because the mean of its divisors is an integer number (3252597840).

Almost surely, 2^21113354215 is an apocalyptic number.

21113354215 is a deficient number, since it is larger than the sum of its proper divisors (4907428505).

21113354215 is a wasteful number, since it uses less digits than its factorization.

21113354215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114126281.

The product of its digits is 3600, while the sum is 28.

Adding to 21113354215 its reverse (51245331112), we get a palindrome (72358685327).

The spelling of 21113354215 in words is "twenty-one billion, one hundred thirteen million, three hundred fifty-four thousand, two hundred fifteen".