1220222220221 has 16 divisors (see below), whose sum is σ = 1237953822768. Its totient is φ = 1202604480000.

The previous prime is 1220222220209. The next prime is 1220222220263.

1220222220221 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 8 ways, for example, as 416708980900 + 803513239321 = 645530^2 + 896389^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220222220221 - 2⁶ = 1220222220157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220222220193 and 1220222220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220222220281) 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, 123237371 + ... + 123247271.

It is an arithmetic number, because the mean of its divisors is an integer number (77372113923).

Almost surely, 2^{1220222220221} is an apocalyptic number.

It is an amenable number.

1220222220221 is a deficient number, since it is larger than the sum of its proper divisors (17731602547).

1220222220221 is a wasteful number, since it uses less digits than its factorization.

1220222220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15472.

The product of its (nonzero) digits is 512, while the sum is 20.

The spelling of 1220222220221 in words is "one trillion, two hundred twenty billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".