11021221231 has 2 divisors, whose sum is σ = 11021221232. Its totient is φ = 11021221230.

The previous prime is 11021221217. The next prime is 11021221247. The reversal of 11021221231 is 13212212011.

It is an a-pointer prime, because the next prime (11021221247) can be obtained adding 11021221231 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11021221231 - 2⁵ = 11021221199 is a prime.

It is a super-2 number, since 2×11021221231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021221201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510610615 + 5510610616.

It is an arithmetic number, because the mean of its divisors is an integer number (5510610616).

Almost surely, 2^11021221231 is an apocalyptic number.

11021221231 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021221231 is an equidigital number, since it uses as much as digits as its factorization.

11021221231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11021221231 its reverse (13212212011), we get a palindrome (24233433242).

The spelling of 11021221231 in words is "eleven billion, twenty-one million, two hundred twenty-one thousand, two hundred thirty-one".