11212120020 has 96 divisors (see below), whose sum is σ = 33081713280. Its totient is φ = 2829496320.

The previous prime is 11212119979. The next prime is 11212120033. The reversal of 11212120020 is 2002121211.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 11212119978 and 11212120005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1172860 + ... + 1182380.

It is an arithmetic number, because the mean of its divisors is an integer number (344601180).

Almost surely, 2^11212120020 is an apocalyptic number.

11212120020 is a gapful number since it is divisible by the number (10) 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 11212120020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16540856640).

11212120020 is an abundant number, since it is smaller than the sum of its proper divisors (21869593260).

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

11212120020 is a wasteful number, since it uses less digits than its factorization.

11212120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10585 (or 10583 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 11212120020 its reverse (2002121211), we get a palindrome (13214241231).

The spelling of 11212120020 in words is "eleven billion, two hundred twelve million, one hundred twenty thousand, twenty".