21534204016 has 40 divisors (see below), whose sum is σ = 44987700464. Its totient is φ = 9926530560.

The previous prime is 21534203993. The next prime is 21534204053. The reversal of 21534204016 is 61040243512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104860 + ... + 232516.

Almost surely, 2^21534204016 is an apocalyptic number.

21534204016 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21534204016 is an abundant number, since it is smaller than the sum of its proper divisors (23453496448).

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

21534204016 is a wasteful number, since it uses less digits than its factorization.

21534204016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128489 (or 128483 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 21534204016 its reverse (61040243512), we get a palindrome (82574447528).

The spelling of 21534204016 in words is "twenty-one billion, five hundred thirty-four million, two hundred four thousand, sixteen".