21628214706 has 32 divisors (see below), whose sum is σ = 49447951488. Its totient is φ = 6177985920.

The previous prime is 21628214689. The next prime is 21628214731. The reversal of 21628214706 is 60741282612.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118086 + ... + 239166.

It is an arithmetic number, because the mean of its divisors is an integer number (1545248484).

Almost surely, 2^21628214706 is an apocalyptic number.

21628214706 is an abundant number, since it is smaller than the sum of its proper divisors (27819736782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21628214706 is a wasteful number, since it uses less digits than its factorization.

21628214706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125346.

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 21628214706 in words is "twenty-one billion, six hundred twenty-eight million, two hundred fourteen thousand, seven hundred six".