1222220121021 has 12 divisors (see below), whose sum is σ = 1765450987872. Its totient is φ = 814803295176.

The previous prime is 1222220121019. The next prime is 1222220121071. The reversal of 1222220121021 is 1201210222221.

It is a happy number.

1222220121021 is a `hidden beast` number, since 12 + 222 + 201 + 210 + 21 = 666.

It is not a de Polignac number, because 1222220121021 - 2¹ = 1222220121019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222220120985 and 1222220121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222220121071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37761 + ... + 1563926.

It is an arithmetic number, because the mean of its divisors is an integer number (147120915656).

Almost surely, 2^{1222220121021} is an apocalyptic number.

It is an amenable number.

1222220121021 is a deficient number, since it is larger than the sum of its proper divisors (543230866851).

1222220121021 is a wasteful number, since it uses less digits than its factorization.

1222220121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686480 (or 1686477 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1222220121021 its reverse (1201210222221), we get a palindrome (2423430343242).

The spelling of 1222220121021 in words is "one trillion, two hundred twenty-two billion, two hundred twenty million, one hundred twenty-one thousand, twenty-one".