220215405221 has 4 divisors (see below), whose sum is σ = 251674748832. Its totient is φ = 188756061612.

The previous prime is 220215405187. The next prime is 220215405269. The reversal of 220215405221 is 122504512022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220215405221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220215405521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15729671795 + ... + 15729671808.

It is an arithmetic number, because the mean of its divisors is an integer number (62918687208).

Almost surely, 2^220215405221 is an apocalyptic number.

It is an amenable number.

220215405221 is a deficient number, since it is larger than the sum of its proper divisors (31459343611).

220215405221 is an equidigital number, since it uses as much as digits as its factorization.

220215405221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31459343610.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 220215405221 its reverse (122504512022), we get a palindrome (342719917243).

The spelling of 220215405221 in words is "two hundred twenty billion, two hundred fifteen million, four hundred five thousand, two hundred twenty-one".