21434004312 has 64 divisors (see below), whose sum is σ = 61261132800. Its totient is φ = 6121889280.

The previous prime is 21434004299. The next prime is 21434004323. The reversal of 21434004312 is 21340043412.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 503889 + ... + 544767.

It is an arithmetic number, because the mean of its divisors is an integer number (957205200).

Almost surely, 2^21434004312 is an apocalyptic number.

It is an amenable number.

21434004312 is an abundant number, since it is smaller than the sum of its proper divisors (39827128488).

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

21434004312 is a wasteful number, since it uses less digits than its factorization.

21434004312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44016 (or 44012 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21434004312 its reverse (21340043412), we get a palindrome (42774047724).

The spelling of 21434004312 in words is "twenty-one billion, four hundred thirty-four million, four thousand, three hundred twelve".