21334678516 has 48 divisors (see below), whose sum is σ = 38775385600. Its totient is φ = 10260432000.

The previous prime is 21334678511. The next prime is 21334678529. The reversal of 21334678516 is 61587643312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334678511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18218611 + ... + 18219781.

Almost surely, 2^21334678516 is an apocalyptic number.

It is an amenable number.

21334678516 is a deficient number, since it is larger than the sum of its proper divisors (17440707084).

21334678516 is a wasteful number, since it uses less digits than its factorization.

21334678516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976 (or 1974 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The spelling of 21334678516 in words is "twenty-one billion, three hundred thirty-four million, six hundred seventy-eight thousand, five hundred sixteen".