10221210111221 has 4 divisors (see below), whose sum is σ = 10225014062592. Its totient is φ = 10217406159852.

The previous prime is 10221210111199. The next prime is 10221210111247. The reversal of 10221210111221 is 12211101212201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10221210111221 - 2²² = 10221205916917 is a prime.

It is a super-2 number, since 2×10221210111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10221210111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221210111821) 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, 1901971655 + ... + 1901977028.

It is an arithmetic number, because the mean of its divisors is an integer number (2556253515648).

Almost surely, 2^{10221210111221} is an apocalyptic number.

It is an amenable number.

10221210111221 is a deficient number, since it is larger than the sum of its proper divisors (3803951371).

10221210111221 is an equidigital number, since it uses as much as digits as its factorization.

10221210111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3803951370.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 10221210111221 its reverse (12211101212201), we get a palindrome (22432311323422).

The spelling of 10221210111221 in words is "ten trillion, two hundred twenty-one billion, two hundred ten million, one hundred eleven thousand, two hundred twenty-one".