21006174430 has 32 divisors (see below), whose sum is σ = 39049463808. Its totient is φ = 8127540000.

The previous prime is 21006174421. The next prime is 21006174433. The reversal of 21006174430 is 3447160012.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21006174433) 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, 682759 + ... + 712861.

It is an arithmetic number, because the mean of its divisors is an integer number (1220295744).

Almost surely, 2^21006174430 is an apocalyptic number.

21006174430 is a deficient number, since it is larger than the sum of its proper divisors (18043289378).

21006174430 is a wasteful number, since it uses less digits than its factorization.

21006174430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32392.

The product of its (nonzero) digits is 4032, while the sum is 28.

The spelling of 21006174430 in words is "twenty-one billion, six million, one hundred seventy-four thousand, four hundred thirty".