21693029806 has 48 divisors (see below), whose sum is σ = 38383070400. Its totient is φ = 9166929408.

The previous prime is 21693029803. The next prime is 21693029821. The reversal of 21693029806 is 60892039612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21693029803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7810290 + ... + 7813066.

It is an arithmetic number, because the mean of its divisors is an integer number (799647300).

Almost surely, 2^21693029806 is an apocalyptic number.

21693029806 is a deficient number, since it is larger than the sum of its proper divisors (16690040594).

21693029806 is a wasteful number, since it uses less digits than its factorization.

21693029806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3881 (or 3874 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 21693029806 in words is "twenty-one billion, six hundred ninety-three million, twenty-nine thousand, eight hundred six".