21467810052 has 240 divisors, whose sum is σ = 65365090560. Its totient is φ = 6083693568.

The previous prime is 21467810029. The next prime is 21467810059. The reversal of 21467810052 is 25001876412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21467809989 and 21467810016.

It is not an unprimeable number, because it can be changed into a prime (21467810059) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 3362199 + ... + 3368577.

It is an arithmetic number, because the mean of its divisors is an integer number (272354544).

Almost surely, 2^21467810052 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21467810052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32682545280).

21467810052 is an abundant number, since it is smaller than the sum of its proper divisors (43897280508).

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

21467810052 is a wasteful number, since it uses less digits than its factorization.

21467810052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6472 (or 6461 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 21467810052 in words is "twenty-one billion, four hundred sixty-seven million, eight hundred ten thousand, fifty-two".