221021313215 has 8 divisors (see below), whose sum is σ = 265238852208. Its totient is φ = 176808199680.

The previous prime is 221021313179. The next prime is 221021313269. The reversal of 221021313215 is 512313120122.

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

It is not a de Polignac number, because 221021313215 - 2²⁸ = 220752877759 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, 995477 + ... + 1197086.

It is an arithmetic number, because the mean of its divisors is an integer number (33154856526).

Almost surely, 2^221021313215 is an apocalyptic number.

221021313215 is a deficient number, since it is larger than the sum of its proper divisors (44217538993).

221021313215 is a wasteful number, since it uses less digits than its factorization.

221021313215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212729.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 221021313215 its reverse (512313120122), we get a palindrome (733334433337).

The spelling of 221021313215 in words is "two hundred twenty-one billion, twenty-one million, three hundred thirteen thousand, two hundred fifteen".