12021617652 has 72 divisors (see below), whose sum is σ = 30883519296. Its totient is φ = 3636864000.

The previous prime is 12021617611. The next prime is 12021617681. The reversal of 12021617652 is 25671612021.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 909652 + ... + 922772.

It is an arithmetic number, because the mean of its divisors is an integer number (428937768).

Almost surely, 2^12021617652 is an apocalyptic number.

12021617652 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 12021617652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15441759648).

12021617652 is an abundant number, since it is smaller than the sum of its proper divisors (18861901644).

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

12021617652 is a wasteful number, since it uses less digits than its factorization.

12021617652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13781 (or 13768 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 12021617652 in words is "twelve billion, twenty-one million, six hundred seventeen thousand, six hundred fifty-two".