21220241442215 has 4 divisors (see below), whose sum is σ = 25464289730664. Its totient is φ = 16976193153768.

The previous prime is 21220241442199. The next prime is 21220241442233. The reversal of 21220241442215 is 51224414202212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21220241442215 - 2⁴ = 21220241442199 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 3 ways as a sum of consecutive naturals, for example, 2122024144217 + ... + 2122024144226.

It is an arithmetic number, because the mean of its divisors is an integer number (6366072432666).

Almost surely, 2^{21220241442215} is an apocalyptic number.

21220241442215 is a deficient number, since it is larger than the sum of its proper divisors (4244048288449).

21220241442215 is an equidigital number, since it uses as much as digits as its factorization.

21220241442215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4244048288448.

The product of its (nonzero) digits is 20480, while the sum is 32.

Adding to 21220241442215 its reverse (51224414202212), we get a palindrome (72444655644427).

The spelling of 21220241442215 in words is "twenty-one trillion, two hundred twenty billion, two hundred forty-one million, four hundred forty-two thousand, two hundred fifteen".