21719171006 has 16 divisors (see below), whose sum is σ = 35090379744. Its totient is φ = 10022642784.

The previous prime is 21719170961. The next prime is 21719171011. The reversal of 21719171006 is 60017191712.

It is a congruent number.

It is an unprimeable number.

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, 109631 + ... + 235493.

It is an arithmetic number, because the mean of its divisors is an integer number (2193148734).

Almost surely, 2^21719171006 is an apocalyptic number.

21719171006 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21719171006 is a deficient number, since it is larger than the sum of its proper divisors (13371208738).

21719171006 is a wasteful number, since it uses less digits than its factorization.

21719171006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132515.

The product of its (nonzero) digits is 5292, while the sum is 35.

The spelling of 21719171006 in words is "twenty-one billion, seven hundred nineteen million, one hundred seventy-one thousand, six".