1011222212221 has 8 divisors (see below), whose sum is σ = 1089027419480. Its totient is φ = 933419702592.

The previous prime is 1011222212171. The next prime is 1011222212227. The reversal of 1011222212221 is 1222122221101.

It can be written as a sum of positive squares in 4 ways, for example, as 50800652100 + 960421560121 = 225390^2 + 980011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1011222212221 - 2⁹ = 1011222211709 is a prime.

It is a super-3 number, since 3×1011222212221³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011222212227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140635 + ... + 1429063.

It is an arithmetic number, because the mean of its divisors is an integer number (136128427435).

Almost surely, 2^{1011222212221} is an apocalyptic number.

It is an amenable number.

1011222212221 is a deficient number, since it is larger than the sum of its proper divisors (77805207259).

1011222212221 is a wasteful number, since it uses less digits than its factorization.

1011222212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348815.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1011222212221 its reverse (1222122221101), we get a palindrome (2233344433322).

The spelling of 1011222212221 in words is "one trillion, eleven billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".