220220212221221 has 4 divisors (see below), whose sum is σ = 220288412971500. Its totient is φ = 220152011470944.

The previous prime is 220220212221173. The next prime is 220220212221253. The reversal of 220220212221221 is 122122212022022.

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

It can be written as a sum of positive squares in 2 ways, for example, as 87458220648100 + 132761991573121 = 9351910^2 + 11522239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220220212221221 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 (220220212221521) 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, 34100370296 + ... + 34100376753.

It is an arithmetic number, because the mean of its divisors is an integer number (55072103242875).

Almost surely, 2^{220220212221221} is an apocalyptic number.

It is an amenable number.

220220212221221 is a deficient number, since it is larger than the sum of its proper divisors (68200750279).

220220212221221 is an equidigital number, since it uses as much as digits as its factorization.

220220212221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68200750278.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 220220212221221 its reverse (122122212022022), we get a palindrome (342342424243243).

The spelling of 220220212221221 in words is "two hundred twenty trillion, two hundred twenty billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".