21234514608 has 160 divisors (see below), whose sum is σ = 64784345600. Its totient is φ = 6640268544.

The previous prime is 21234514591. The next prime is 21234514621. The reversal of 21234514608 is 80641543212.

It is a happy number.

21234514608 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 45 + 1 + 4 + 608 = 666.

It is a super-2 number, since 2×21234514608² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 832866 + ... + 857982.

It is an arithmetic number, because the mean of its divisors is an integer number (404902160).

Almost surely, 2^21234514608 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 21234514608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32392172800).

21234514608 is an abundant number, since it is smaller than the sum of its proper divisors (43549830992).

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

21234514608 is a wasteful number, since it uses less digits than its factorization.

21234514608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25256 (or 25244 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 21234514608 in words is "twenty-one billion, two hundred thirty-four million, five hundred fourteen thousand, six hundred eight".