10221111221 has 4 divisors (see below), whose sum is σ = 10322310444. Its totient is φ = 10119912000.

The previous prime is 10221111203. The next prime is 10221111227. The reversal of 10221111221 is 12211112201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12211112201 = 101 ⋅120902101.

It can be written as a sum of positive squares in 2 ways, for example, as 9344122225 + 876988996 = 96665^2 + 29614^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221111221 - 2¹⁴ = 10221094837 is a prime.

It is a super-2 number, since 2×10221111221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10221111196 and 10221111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221111227) 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, 50599460 + ... + 50599661.

It is an arithmetic number, because the mean of its divisors is an integer number (2580577611).

Almost surely, 2^10221111221 is an apocalyptic number.

It is an amenable number.

10221111221 is a deficient number, since it is larger than the sum of its proper divisors (101199223).

10221111221 is a wasteful number, since it uses less digits than its factorization.

10221111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101199222.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 10221111221 its reverse (12211112201), we get a palindrome (22432223422).

The spelling of 10221111221 in words is "ten billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".