21229683728906 has 16 divisors (see below), whose sum is σ = 32009684129280. Its totient is φ = 10559923132080.

The previous prime is 21229683728899. The next prime is 21229683728917. The reversal of 21229683728906 is 60982738692212.

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, 33211226 + ... + 33844421.

It is an arithmetic number, because the mean of its divisors is an integer number (2000605258080).

Almost surely, 2^{21229683728906} is an apocalyptic number.

21229683728906 is a deficient number, since it is larger than the sum of its proper divisors (10780000400374).

21229683728906 is a wasteful number, since it uses less digits than its factorization.

21229683728906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67056469.

The product of its (nonzero) digits is 62705664, while the sum is 65.

The spelling of 21229683728906 in words is "twenty-one trillion, two hundred twenty-nine billion, six hundred eighty-three million, seven hundred twenty-eight thousand, nine hundred six".