21128430006 has 24 divisors (see below), whose sum is σ = 45914118744. Its totient is φ = 7021909440.

The previous prime is 21128429983. The next prime is 21128430007. The reversal of 21128430006 is 60003482112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21128430007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1735480 + ... + 1747611.

It is an arithmetic number, because the mean of its divisors is an integer number (1913088281).

Almost surely, 2^21128430006 is an apocalyptic number.

21128430006 is an abundant number, since it is smaller than the sum of its proper divisors (24785688738).

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

21128430006 is a wasteful number, since it uses less digits than its factorization.

21128430006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3483436 (or 3483433 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The spelling of 21128430006 in words is "twenty-one billion, one hundred twenty-eight million, four hundred thirty thousand, six".