11203312321212 has 192 divisors, whose sum is σ = 31305210531840. Its totient is φ = 3078661017600.

The previous prime is 11203312321211. The next prime is 11203312321237. The reversal of 11203312321212 is 21212321330211.

It is a super-2 number, since 2×11203312321212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11203312321211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15578518 + ... + 16281794.

It is an arithmetic number, because the mean of its divisors is an integer number (163047971520).

Almost surely, 2^{11203312321212} is an apocalyptic number.

11203312321212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11203312321212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15652605265920).

11203312321212 is an abundant number, since it is smaller than the sum of its proper divisors (20101898210628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11203312321212 is a wasteful number, since it uses less digits than its factorization.

11203312321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703572 (or 703570 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 11203312321212 its reverse (21212321330211), we get a palindrome (32415633651423).

The spelling of 11203312321212 in words is "eleven trillion, two hundred three billion, three hundred twelve million, three hundred twenty-one thousand, two hundred twelve".