21668746126 has 16 divisors (see below), whose sum is σ = 32557140000. Its totient is φ = 10816382848.

The previous prime is 21668746117. The next prime is 21668746129. The reversal of 21668746126 is 62164786612.

It is a self number, because there is not a number n which added to its sum of digits gives 21668746126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21668746129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4010775 + ... + 4016173.

It is an arithmetic number, because the mean of its divisors is an integer number (2034821250).

Almost surely, 2^21668746126 is an apocalyptic number.

21668746126 is a deficient number, since it is larger than the sum of its proper divisors (10888393874).

21668746126 is a wasteful number, since it uses less digits than its factorization.

21668746126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8363.

The product of its digits is 1161216, while the sum is 49.

The spelling of 21668746126 in words is "twenty-one billion, six hundred sixty-eight million, seven hundred forty-six thousand, one hundred twenty-six".