21000634231 has 8 divisors (see below), whose sum is σ = 21567050064. Its totient is φ = 20436799680.

The previous prime is 21000634183. The next prime is 21000634243. The reversal of 21000634231 is 13243600012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21000634231 - 2¹¹ = 21000632183 is a prime.

It is a super-2 number, since 2×21000634231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000634271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628825 + ... + 661378.

It is an arithmetic number, because the mean of its divisors is an integer number (2695881258).

Almost surely, 2^21000634231 is an apocalyptic number.

21000634231 is a deficient number, since it is larger than the sum of its proper divisors (566415833).

21000634231 is a wasteful number, since it uses less digits than its factorization.

21000634231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290641.

The product of its (nonzero) digits is 864, while the sum is 22.

The spelling of 21000634231 in words is "twenty-one billion, six hundred thirty-four thousand, two hundred thirty-one".