1220220012221 has 32 divisors (see below), whose sum is σ = 1435660800000. Its totient is φ = 1036620604656.

The previous prime is 1220220012169. The next prime is 1220220012223. The reversal of 1220220012221 is 1222100220221.

It is a happy number.

It is not a de Polignac number, because 1220220012221 - 2³⁴ = 1203040143037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220220012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220220012223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28537160 + ... + 28579886.

It is an arithmetic number, because the mean of its divisors is an integer number (44864400000).

Almost surely, 2^{1220220012221} is an apocalyptic number.

It is an amenable number.

1220220012221 is a deficient number, since it is larger than the sum of its proper divisors (215440787779).

1220220012221 is an equidigital number, since it uses as much as digits as its factorization.

1220220012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43486 (or 43472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1220220012221 its reverse (1222100220221), we get a palindrome (2442320232442).

The spelling of 1220220012221 in words is "one trillion, two hundred twenty billion, two hundred twenty million, twelve thousand, two hundred twenty-one".