21535503486 has 16 divisors (see below), whose sum is σ = 49224008064. Its totient is φ = 6153000984.

The previous prime is 21535503419. The next prime is 21535503487. The reversal of 21535503486 is 68430553512.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 512750083 = 21535503486 / (2 + 1 + 5 + 3 + 5 + 5 + 0 + 3 + 4 + 8 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535503487) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 256375000 + ... + 256375083.

It is an arithmetic number, because the mean of its divisors is an integer number (3076500504).

Almost surely, 2^21535503486 is an apocalyptic number.

21535503486 is an abundant number, since it is smaller than the sum of its proper divisors (27688504578).

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

21535503486 is a wasteful number, since it uses less digits than its factorization.

21535503486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512750095.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 21535503486 in words is "twenty-one billion, five hundred thirty-five million, five hundred three thousand, four hundred eighty-six".