21442535506 has 32 divisors (see below), whose sum is σ = 38930792832. Its totient is φ = 8646892800.

The previous prime is 21442535497. The next prime is 21442535537. The reversal of 21442535506 is 60553524412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1193220 + ... + 1211056.

It is an arithmetic number, because the mean of its divisors is an integer number (1216587276).

Almost surely, 2^21442535506 is an apocalyptic number.

21442535506 is a deficient number, since it is larger than the sum of its proper divisors (17488257326).

21442535506 is a wasteful number, since it uses less digits than its factorization.

21442535506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22914.

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 21442535506 in words is "twenty-one billion, four hundred forty-two million, five hundred thirty-five thousand, five hundred six".