220000001221 has 64 divisors (see below), whose sum is σ = 297028892160. Its totient is φ = 157363752960.

The previous prime is 220000001191. The next prime is 220000001233. The reversal of 220000001221 is 122100000022.

It is a cyclic number.

It is not a de Polignac number, because 220000001221 - 2¹⁷ = 219999870149 is a prime.

220000001221 is a modest number, since divided by 1221 gives 220 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 220000001198 and 220000001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220000001251) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 256709025 + ... + 256709881.

It is an arithmetic number, because the mean of its divisors is an integer number (4641076440).

Almost surely, 2^220000001221 is an apocalyptic number.

It is an amenable number.

220000001221 is a deficient number, since it is larger than the sum of its proper divisors (77028890939).

220000001221 is a wasteful number, since it uses less digits than its factorization.

220000001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 220000001221 its reverse (122100000022), we get a palindrome (342100001243).

The spelling of 220000001221 in words is "two hundred twenty billion, one thousand, two hundred twenty-one".