1022111211221 has 4 divisors (see below), whose sum is σ = 1022158176972. Its totient is φ = 1022064245472.

The previous prime is 1022111211203. The next prime is 1022111211239. The reversal of 1022111211221 is 1221121112201.

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

It is an interprime number because it is at equal distance from previous prime (1022111211203) and next prime (1022111211239).

It can be written as a sum of positive squares in 2 ways, for example, as 85936922500 + 936174288721 = 293150^2 + 967561^2 .

It is a cyclic number.

It is not a de Polignac number, because 1022111211221 - 2¹⁸ = 1022110949077 is a prime.

It is a super-2 number, since 2×1022111211221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1022111211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022111211241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23450216 + ... + 23493761.

It is an arithmetic number, because the mean of its divisors is an integer number (255539544243).

Almost surely, 2^{1022111211221} is an apocalyptic number.

It is an amenable number.

1022111211221 is a deficient number, since it is larger than the sum of its proper divisors (46965751).

1022111211221 is an equidigital number, since it uses as much as digits as its factorization.

1022111211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46965750.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1022111211221 its reverse (1221121112201), we get a palindrome (2243232323422).

The spelling of 1022111211221 in words is "one trillion, twenty-two billion, one hundred eleven million, two hundred eleven thousand, two hundred twenty-one".