11021211231 has 72 divisors (see below), whose sum is σ = 17202570624. Its totient is φ = 6262375680.

The previous prime is 11021211221. The next prime is 11021211239. The reversal of 11021211231 is 13211212011.

It is not a de Polignac number, because 11021211231 - 2⁵ = 11021211199 is a prime.

It is a super-2 number, since 2×11021211231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11021211231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021211239) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7197936 + ... + 7199466.

It is an arithmetic number, because the mean of its divisors is an integer number (238924592).

Almost surely, 2^11021211231 is an apocalyptic number.

11021211231 is a deficient number, since it is larger than the sum of its proper divisors (6181359393).

11021211231 is a wasteful number, since it uses less digits than its factorization.

11021211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629 (or 1593 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 11021211231 its reverse (13211212011), we get a palindrome (24232423242).

The spelling of 11021211231 in words is "eleven billion, twenty-one million, two hundred eleven thousand, two hundred thirty-one".