21713008906 has 32 divisors (see below), whose sum is σ = 35124503040. Its totient is φ = 10030016256.

The previous prime is 21713008901. The next prime is 21713008927. The reversal of 21713008906 is 60980031712.

It is not an unprimeable number, because it can be changed into a prime (21713008901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441315 + ... + 488041.

It is an arithmetic number, because the mean of its divisors is an integer number (1097640720).

Almost surely, 2^21713008906 is an apocalyptic number.

21713008906 is a deficient number, since it is larger than the sum of its proper divisors (13411494134).

21713008906 is a wasteful number, since it uses less digits than its factorization.

21713008906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46998.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 21713008906 in words is "twenty-one billion, seven hundred thirteen million, eight thousand, nine hundred six".