21540321146 has 16 divisors (see below), whose sum is σ = 33723817344. Its totient is φ = 10299285744.

The previous prime is 21540321133. The next prime is 21540321157. The reversal of 21540321146 is 64112304512.

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, 131075 + ... + 245481.

It is an arithmetic number, because the mean of its divisors is an integer number (2107738584).

Almost surely, 2^21540321146 is an apocalyptic number.

21540321146 is a deficient number, since it is larger than the sum of its proper divisors (12183496198).

21540321146 is a wasteful number, since it uses less digits than its factorization.

21540321146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118525.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21540321146 its reverse (64112304512), we get a palindrome (85652625658).

The spelling of 21540321146 in words is "twenty-one billion, five hundred forty million, three hundred twenty-one thousand, one hundred forty-six".