11212001220 has 192 divisors, whose sum is σ = 36943441920. Its totient is φ = 2487034368.

The previous prime is 11212001219. The next prime is 11212001233. The reversal of 11212001220 is 2210021211.

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 = 11212001196 and 11212001205.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8499721 + ... + 8501039.

It is an arithmetic number, because the mean of its divisors is an integer number (192413760).

Almost surely, 2^11212001220 is an apocalyptic number.

11212001220 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 11212001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18471720960).

11212001220 is an abundant number, since it is smaller than the sum of its proper divisors (25731440700).

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

11212001220 is a wasteful number, since it uses less digits than its factorization.

11212001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922 (or 1920 counting only the distinct ones).

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

Adding to 11212001220 its reverse (2210021211), we get a palindrome (13422022431).

The spelling of 11212001220 in words is "eleven billion, two hundred twelve million, one thousand, two hundred twenty".