21617751126 has 16 divisors (see below), whose sum is σ = 44726382000. Its totient is φ = 6957437088.

The previous prime is 21617751119. The next prime is 21617751149. The reversal of 21617751126 is 62115771612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62119801 + ... + 62120148.

It is an arithmetic number, because the mean of its divisors is an integer number (2795398875).

Almost surely, 2^21617751126 is an apocalyptic number.

21617751126 is an abundant number, since it is smaller than the sum of its proper divisors (23108630874).

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

21617751126 is a wasteful number, since it uses less digits than its factorization.

21617751126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124239983.

The product of its digits is 35280, while the sum is 39.

The spelling of 21617751126 in words is "twenty-one billion, six hundred seventeen million, seven hundred fifty-one thousand, one hundred twenty-six".