220021111221 has 8 divisors (see below), whose sum is σ = 293372430624. Its totient is φ = 146675266320.

The previous prime is 220021111217. The next prime is 220021111223. The reversal of 220021111221 is 122111120022.

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

It is not a de Polignac number, because 220021111221 - 2² = 220021111217 is a prime.

It is a super-2 number, since 2×220021111221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220021111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021111223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1273911 + ... + 1436276.

It is an arithmetic number, because the mean of its divisors is an integer number (36671553828).

Almost surely, 2^220021111221 is an apocalyptic number.

It is an amenable number.

220021111221 is a deficient number, since it is larger than the sum of its proper divisors (73351319403).

220021111221 is a wasteful number, since it uses less digits than its factorization.

220021111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737251.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 220021111221 its reverse (122111120022), we get a palindrome (342132231243).

The spelling of 220021111221 in words is "two hundred twenty billion, twenty-one million, one hundred eleven thousand, two hundred twenty-one".