1220202232221 has 16 divisors (see below), whose sum is σ = 1859379300864. Its totient is φ = 697249599024.

The previous prime is 1220202232219. The next prime is 1220202232237. The reversal of 1220202232221 is 1222322020221.

It is not a de Polignac number, because 1220202232221 - 2¹ = 1220202232219 is a prime.

It is a super-2 number, since 2×1220202232221² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220202232201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1569826 + ... + 2214668.

It is an arithmetic number, because the mean of its divisors is an integer number (116211206304).

Almost surely, 2^{1220202232221} is an apocalyptic number.

It is an amenable number.

1220202232221 is a deficient number, since it is larger than the sum of its proper divisors (639177068643).

1220202232221 is an equidigital number, since it uses as much as digits as its factorization.

1220202232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734960.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 1220202232221 its reverse (1222322020221), we get a palindrome (2442524252442).

The spelling of 1220202232221 in words is "one trillion, two hundred twenty billion, two hundred two million, two hundred thirty-two thousand, two hundred twenty-one".