1220222121021 has 12 divisors (see below), whose sum is σ = 1788849677472. Its totient is φ = 801339899976.

The previous prime is 1220222120987. The next prime is 1220222121023. The reversal of 1220222121021 is 1201212220221.

It is a happy number.

1220222121021 is a `hidden beast` number, since 12 + 202 + 221 + 210 + 21 = 666.

It is not a de Polignac number, because 1220222121021 - 2¹³ = 1220222112829 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1220222120985 and 1220222121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220222121023) 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, 1011792201 + ... + 1011793406.

It is an arithmetic number, because the mean of its divisors is an integer number (149070806456).

Almost surely, 2^{1220222121021} is an apocalyptic number.

It is an amenable number.

1220222121021 is a deficient number, since it is larger than the sum of its proper divisors (568627556451).

1220222121021 is a wasteful number, since it uses less digits than its factorization.

1220222121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023585680 (or 2023585677 counting only the distinct ones).

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

Adding to 1220222121021 its reverse (1201212220221), we get a palindrome (2421434341242).

The spelling of 1220222121021 in words is "one trillion, two hundred twenty billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty-one".