11212661220 has 48 divisors (see below), whose sum is σ = 32063447808. Its totient is φ = 2926424320.

The previous prime is 11212661191. The next prime is 11212661231. The reversal of 11212661220 is 2216621211.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1985241 + ... + 1990880.

It is an arithmetic number, because the mean of its divisors is an integer number (667988496).

Almost surely, 2^11212661220 is an apocalyptic number.

11212661220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11212661220 is an abundant number, since it is smaller than the sum of its proper divisors (20850786588).

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

11212661220 is a wasteful number, since it uses less digits than its factorization.

11212661220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976180 (or 3976178 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 11212661220 in words is "eleven billion, two hundred twelve million, six hundred sixty-one thousand, two hundred twenty".