21631340343 has 8 divisors (see below), whose sum is σ = 30359776000. Its totient is φ = 13661899128.

The previous prime is 21631340321. The next prime is 21631340371. The reversal of 21631340343 is 34304313612.

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

It is not a de Polignac number, because 21631340343 - 2¹⁰ = 21631339319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21631340343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21631340743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189748543 + ... + 189748656.

It is an arithmetic number, because the mean of its divisors is an integer number (3794972000).

Almost surely, 2^21631340343 is an apocalyptic number.

21631340343 is a deficient number, since it is larger than the sum of its proper divisors (8728435657).

21631340343 is a wasteful number, since it uses less digits than its factorization.

21631340343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379497221.

The product of its (nonzero) digits is 15552, while the sum is 30.

Adding to 21631340343 its reverse (34304313612), we get a palindrome (55935653955).

The spelling of 21631340343 in words is "twenty-one billion, six hundred thirty-one million, three hundred forty thousand, three hundred forty-three".