11211221111012 has 48 divisors (see below), whose sum is σ = 21223085262960. Its totient is φ = 5151333445632.

The previous prime is 11211221111011. The next prime is 11211221111017. The reversal of 11211221111012 is 21011112211211.

It can be written as a sum of positive squares in 8 ways, for example, as 124825129636 + 11086395981376 = 353306^2 + 3329624^2 .

It is a super-2 number, since 2×11211221111012² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11211221111011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148776608 + ... + 148851944.

It is an arithmetic number, because the mean of its divisors is an integer number (442147609645).

Almost surely, 2^{11211221111012} is an apocalyptic number.

It is an amenable number.

11211221111012 is a deficient number, since it is larger than the sum of its proper divisors (10011864151948).

11211221111012 is a wasteful number, since it uses less digits than its factorization.

11211221111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88080 (or 88078 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11211221111012 its reverse (21011112211211), we get a palindrome (32222333322223).

The spelling of 11211221111012 in words is "eleven trillion, two hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, twelve".