101221222221 has 18 divisors (see below), whose sum is σ = 170079197262. Its totient is φ = 57840698160.

The previous prime is 101221222211. The next prime is 101221222243. The reversal of 101221222221 is 122222122101.

It is a happy number.

101221222221 is a `hidden beast` number, since 1 + 0 + 1 + 221 + 222 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63821916900 + 37399305321 = 252630^2 + 193389^2 .

It is not a de Polignac number, because 101221222221 - 2¹⁴ = 101221205837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101221222194 and 101221222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221222211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 114762850 + ... + 114763731.

Almost surely, 2^101221222221 is an apocalyptic number.

It is an amenable number.

101221222221 is a deficient number, since it is larger than the sum of its proper divisors (68857975041).

101221222221 is a wasteful number, since it uses less digits than its factorization.

101221222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229526601 (or 229526591 counting only the distinct ones).

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

Adding to 101221222221 its reverse (122222122101), we get a palindrome (223443344322).

The spelling of 101221222221 in words is "one hundred one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".