1220111021221 has 8 divisors (see below), whose sum is σ = 1221957266400. Its totient is φ = 1218265010160.

The previous prime is 1220111021201. The next prime is 1220111021251. The reversal of 1220111021221 is 1221201110221.

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

It is a cyclic number.

It is not a de Polignac number, because 1220111021221 - 2¹³ = 1220111013029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220111021195 and 1220111021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220111021201) 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, 12346635 + ... + 12445063.

It is an arithmetic number, because the mean of its divisors is an integer number (152744658300).

Almost surely, 2^{1220111021221} is an apocalyptic number.

It is an amenable number.

1220111021221 is a deficient number, since it is larger than the sum of its proper divisors (1846245179).

1220111021221 is an equidigital number, since it uses as much as digits as its factorization.

1220111021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117059.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1220111021221 its reverse (1221201110221), we get a palindrome (2441312131442).

The spelling of 1220111021221 in words is "one trillion, two hundred twenty billion, one hundred eleven million, twenty-one thousand, two hundred twenty-one".