21184004952 has 128 divisors (see below), whose sum is σ = 64249920000. Its totient is φ = 6413800320.

The previous prime is 21184004917. The next prime is 21184004987. The reversal of 21184004952 is 25940048112.

It is an interprime number because it is at equal distance from previous prime (21184004917) and next prime (21184004987).

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3320838 + ... + 3327210.

It is an arithmetic number, because the mean of its divisors is an integer number (501952500).

Almost surely, 2^21184004952 is an apocalyptic number.

21184004952 is a gapful number since it is divisible by the number (22) 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 21184004952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32124960000).

21184004952 is an abundant number, since it is smaller than the sum of its proper divisors (43065915048).

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

21184004952 is a wasteful number, since it uses less digits than its factorization.

21184004952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7798 (or 7788 counting only the distinct ones).

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

The spelling of 21184004952 in words is "twenty-one billion, one hundred eighty-four million, four thousand, nine hundred fifty-two".