1022221012221 has 12 divisors (see below), whose sum is σ = 1491160685820. Its totient is φ = 674733340800.

The previous prime is 1022221012213. The next prime is 1022221012223. The reversal of 1022221012221 is 1222101222201.

It is a happy number.

1022221012221 is a `hidden beast` number, since 1 + 0 + 222 + 210 + 12 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 939181944996 + 83039067225 = 969114^2 + 288165^2 .

It is not a de Polignac number, because 1022221012221 - 2³ = 1022221012213 is a prime.

It is a super-2 number, since 2×1022221012221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1022221012194 and 1022221012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022221012223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 562276876 + ... + 562278693.

It is an arithmetic number, because the mean of its divisors is an integer number (124263390485).

Almost surely, 2^{1022221012221} is an apocalyptic number.

It is an amenable number.

1022221012221 is a deficient number, since it is larger than the sum of its proper divisors (468939673599).

1022221012221 is a wasteful number, since it uses less digits than its factorization.

1022221012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124555676 (or 1124555673 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1022221012221 its reverse (1222101222201), we get a palindrome (2244322234422).

The spelling of 1022221012221 in words is "one trillion, twenty-two billion, two hundred twenty-one million, twelve thousand, two hundred twenty-one".