21668534014 has 16 divisors (see below), whose sum is σ = 32772418560. Its totient is φ = 10744758360.

The previous prime is 21668533993. The next prime is 21668534029. The reversal of 21668534014 is 41043586612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28707 + ... + 210145.

It is an arithmetic number, because the mean of its divisors is an integer number (2048276160).

Almost surely, 2^21668534014 is an apocalyptic number.

21668534014 is a deficient number, since it is larger than the sum of its proper divisors (11103884546).

21668534014 is a wasteful number, since it uses less digits than its factorization.

21668534014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181935.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 21668534014 in words is "twenty-one billion, six hundred sixty-eight million, five hundred thirty-four thousand, fourteen".