1222101021221 has 6 divisors (see below), whose sum is σ = 1252635373266. Its totient is φ = 1192293677600.

The previous prime is 1222101021217. The next prime is 1222101021223. The reversal of 1222101021221 is 1221201012221.

It can be written as a sum of positive squares in 3 ways, for example, as 113262537025 + 1108838484196 = 336545^2 + 1053014^2 .

It is not a de Polignac number, because 1222101021221 - 2² = 1222101021217 is a prime.

It is a super-2 number, since 2×1222101021221² (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 1222101021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222101021223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 363502490 + ... + 363505851.

It is an arithmetic number, because the mean of its divisors is an integer number (208772562211).

Almost surely, 2^{1222101021221} is an apocalyptic number.

It is an amenable number.

1222101021221 is a deficient number, since it is larger than the sum of its proper divisors (30534352045).

1222101021221 is an frugal number, since it uses more digits than its factorization.

1222101021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727008423 (or 727008382 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1222101021221 its reverse (1221201012221), we get a palindrome (2443302033442).

The spelling of 1222101021221 in words is "one trillion, two hundred twenty-two billion, one hundred one million, twenty-one thousand, two hundred twenty-one".