21334515912 has 64 divisors (see below), whose sum is σ = 59361840000. Its totient is φ = 7099589952.

The previous prime is 21334515907. The next prime is 21334515929. The reversal of 21334515912 is 21951543312.

It is a happy number.

21334515912 is a `hidden beast` number, since 2 + 13 + 3 + 4 + 51 + 591 + 2 = 666.

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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46938 + ... + 211830.

It is an arithmetic number, because the mean of its divisors is an integer number (927528750).

Almost surely, 2^21334515912 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 21334515912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29680920000).

21334515912 is an abundant number, since it is smaller than the sum of its proper divisors (38027324088).

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

21334515912 is a wasteful number, since it uses less digits than its factorization.

21334515912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165507 (or 165497 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The spelling of 21334515912 in words is "twenty-one billion, three hundred thirty-four million, five hundred fifteen thousand, nine hundred twelve".