21112203215 has 8 divisors (see below), whose sum is σ = 25585482528. Its totient is φ = 16722536800.

The previous prime is 21112203187. The next prime is 21112203247. The reversal of 21112203215 is 51230221112.

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

It is not a de Polignac number, because 21112203215 - 2²⁴ = 21095425999 is a prime.

It is a Duffinian number.

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, 20902667 + ... + 20903676.

It is an arithmetic number, because the mean of its divisors is an integer number (3198185316).

Almost surely, 2^21112203215 is an apocalyptic number.

21112203215 is a deficient number, since it is larger than the sum of its proper divisors (4473279313).

21112203215 is a wasteful number, since it uses less digits than its factorization.

21112203215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41806449.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21112203215 its reverse (51230221112), we get a palindrome (72342424327).

The spelling of 21112203215 in words is "twenty-one billion, one hundred twelve million, two hundred three thousand, two hundred fifteen".