11221403221 has 6 divisors (see below), whose sum is σ = 13053469110. Its totient is φ = 9618345576.

The previous prime is 11221403209. The next prime is 11221403233. The reversal of 11221403221 is 12230412211.

It is an interprime number because it is at equal distance from previous prime (11221403209) and next prime (11221403233).

It can be written as a sum of positive squares in only one way, i.e., 9149879025 + 2071524196 = 95655^2 + 45514^2 .

It is not a de Polignac number, because 11221403221 - 2¹⁵ = 11221370453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221403251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 114504066 + ... + 114504163.

It is an arithmetic number, because the mean of its divisors is an integer number (2175578185).

Almost surely, 2^11221403221 is an apocalyptic number.

It is an amenable number.

11221403221 is a deficient number, since it is larger than the sum of its proper divisors (1832065889).

11221403221 is an equidigital number, since it uses as much as digits as its factorization.

11221403221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229008243 (or 229008236 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 11221403221 its reverse (12230412211), we get a palindrome (23451815432).

The spelling of 11221403221 in words is "eleven billion, two hundred twenty-one million, four hundred three thousand, two hundred twenty-one".