1022021223221 has 4 divisors (see below), whose sum is σ = 1022361786444. Its totient is φ = 1021680660000.

The previous prime is 1022021223193. The next prime is 1022021223229. The reversal of 1022021223221 is 1223221202201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 530464588900 + 491556634321 = 728330^2 + 701111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1022021223221 is a prime.

It is a super-2 number, since 2×1022021223221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1022021223193 and 1022021223202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022021223229) 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, 170277110 + ... + 170283111.

It is an arithmetic number, because the mean of its divisors is an integer number (255590446611).

Almost surely, 2^{1022021223221} is an apocalyptic number.

It is an amenable number.

1022021223221 is a deficient number, since it is larger than the sum of its proper divisors (340563223).

1022021223221 is an equidigital number, since it uses as much as digits as its factorization.

1022021223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340563222.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1022021223221 its reverse (1223221202201), we get a palindrome (2245242425422).

The spelling of 1022021223221 in words is "one trillion, twenty-two billion, twenty-one million, two hundred twenty-three thousand, two hundred twenty-one".