21534443512 has 64 divisors (see below), whose sum is σ = 41696661600. Its totient is φ = 10422182400.

The previous prime is 21534443509. The next prime is 21534443527.

21534443512 is nontrivially palindromic in base 10.

It is a congruent number.

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, 9390238 + ... + 9392530.

Almost surely, 2^21534443512 is an apocalyptic number.

It is an amenable number.

21534443512 is a deficient number, since it is larger than the sum of its proper divisors (20162218088).

21534443512 is a wasteful number, since it uses less digits than its factorization.

21534443512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656 (or 2652 counting only the distinct ones).

The product of its digits is 57600, while the sum is 34.

The spelling of 21534443512 in words is "twenty-one billion, five hundred thirty-four million, four hundred forty-three thousand, five hundred twelve".