1220002202021 has 16 divisors (see below), whose sum is σ = 1336447531440. Its totient is φ = 1108529479680.

The previous prime is 1220002201997. The next prime is 1220002202051. The reversal of 1220002202021 is 1202022000221.

It can be written as a sum of positive squares in 8 ways, for example, as 7329928225 + 1212672273796 = 85615^2 + 1101214^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220002202021 - 2³⁸ = 945124295077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220002201987 and 1220002202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220002202051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4895681 + ... + 5138841.

It is an arithmetic number, because the mean of its divisors is an integer number (83527970715).

Almost surely, 2^{1220002202021} is an apocalyptic number.

It is an amenable number.

1220002202021 is a deficient number, since it is larger than the sum of its proper divisors (116445329419).

1220002202021 is a wasteful number, since it uses less digits than its factorization.

1220002202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253384.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 1220002202021 its reverse (1202022000221), we get a palindrome (2422024202242).

The spelling of 1220002202021 in words is "one trillion, two hundred twenty billion, two million, two hundred two thousand, twenty-one".