11821546620 has 432 divisors, whose sum is σ = 41461973280. Its totient is φ = 2823994368.

The previous prime is 11821546613. The next prime is 11821546691. The reversal of 11821546620 is 2664512811.

It is a happy number.

11821546620 is a `hidden beast` number, since 1 + 1 + 8 + 21 + 5 + 4 + 6 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 30389386 + ... + 30389774.

It is an arithmetic number, because the mean of its divisors is an integer number (95976790).

Almost surely, 2^11821546620 is an apocalyptic number.

11821546620 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 11821546620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20730986640).

11821546620 is an abundant number, since it is smaller than the sum of its proper divisors (29640426660).

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

11821546620 is a wasteful number, since it uses less digits than its factorization.

11821546620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 11821546620 in words is "eleven billion, eight hundred twenty-one million, five hundred forty-six thousand, six hundred twenty".