21505114352 has 40 divisors (see below), whose sum is σ = 42333387216. Its totient is φ = 10580714496.

The previous prime is 21505114321. The next prime is 21505114361. The reversal of 21505114352 is 25341150512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1037078 + ... + 1057610.

Almost surely, 2^21505114352 is an apocalyptic number.

It is an amenable number.

21505114352 is a deficient number, since it is larger than the sum of its proper divisors (20828272864).

21505114352 is a wasteful number, since it uses less digits than its factorization.

21505114352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21585 (or 21579 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 21505114352 its reverse (25341150512), we get a palindrome (46846264864).

The spelling of 21505114352 in words is "twenty-one billion, five hundred five million, one hundred fourteen thousand, three hundred fifty-two".