21542809862 has 32 divisors (see below), whose sum is σ = 38884147200. Its totient is φ = 8744476608.

The previous prime is 21542809859. The next prime is 21542809909. The reversal of 21542809862 is 26890824512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1394939 + ... + 1410297.

It is an arithmetic number, because the mean of its divisors is an integer number (1215129600).

Almost surely, 2^21542809862 is an apocalyptic number.

21542809862 is a deficient number, since it is larger than the sum of its proper divisors (17341337338).

21542809862 is a wasteful number, since it uses less digits than its factorization.

21542809862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20660.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 21542809862 in words is "twenty-one billion, five hundred forty-two million, eight hundred nine thousand, eight hundred sixty-two".