21244233215 has 8 divisors (see below), whose sum is σ = 25498308768. Its totient is φ = 16991900640.

The previous prime is 21244233139. The next prime is 21244233223. The reversal of 21244233215 is 51233244212.

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

It is not a de Polignac number, because 21244233215 - 2¹² = 21244229119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408776 + ... + 457805.

It is an arithmetic number, because the mean of its divisors is an integer number (3187288596).

Almost surely, 2^21244233215 is an apocalyptic number.

21244233215 is a deficient number, since it is larger than the sum of its proper divisors (4254075553).

21244233215 is an equidigital number, since it uses as much as digits as its factorization.

21244233215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871489.

The product of its digits is 11520, while the sum is 29.

Adding to 21244233215 its reverse (51233244212), we get a palindrome (72477477427).

The spelling of 21244233215 in words is "twenty-one billion, two hundred forty-four million, two hundred thirty-three thousand, two hundred fifteen".