10221201221 has 32 divisors (see below), whose sum is σ = 13426974720. Its totient is φ = 7538097600.

The previous prime is 10221201203. The next prime is 10221201233. The reversal of 10221201221 is 12210212201.

It is a de Polignac number, because none of the positive numbers 2^k-10221201221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10221201196 and 10221201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221201521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1865516 + ... + 1870986.

It is an arithmetic number, because the mean of its divisors is an integer number (419592960).

Almost surely, 2^10221201221 is an apocalyptic number.

10221201221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10221201221 is a deficient number, since it is larger than the sum of its proper divisors (3205773499).

10221201221 is a wasteful number, since it uses less digits than its factorization.

10221201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6785.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10221201221 its reverse (12210212201), we get a palindrome (22431413422).

The spelling of 10221201221 in words is "ten billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty-one".