1220221001021 has 4 divisors (see below), whose sum is σ = 1331150182944. Its totient is φ = 1109291819100.

The previous prime is 1220221001009. The next prime is 1220221001063. The reversal of 1220221001021 is 1201001220221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220221001021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220221000987 and 1220221001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221003021) 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 3 ways as a sum of consecutive naturals, for example, 55464590945 + ... + 55464590966.

It is an arithmetic number, because the mean of its divisors is an integer number (332787545736).

Almost surely, 2^{1220221001021} is an apocalyptic number.

1220221001021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220221001021 is a deficient number, since it is larger than the sum of its proper divisors (110929181923).

1220221001021 is a wasteful number, since it uses less digits than its factorization.

1220221001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110929181922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1220221001021 its reverse (1201001220221), we get a palindrome (2421222221242).

The spelling of 1220221001021 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, one thousand, twenty-one".