21667313534 has 8 divisors (see below), whose sum is σ = 32516730720. Its totient is φ = 10828403296.

The previous prime is 21667313531. The next prime is 21667313579. The reversal of 21667313534 is 43531376612.

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

It is a junction number, because it is equal to n+sod(n) for n = 21667313491 and 21667313500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21667313531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2621579 + ... + 2629830.

It is an arithmetic number, because the mean of its divisors is an integer number (4064591340).

Almost surely, 2^21667313534 is an apocalyptic number.

21667313534 is a deficient number, since it is larger than the sum of its proper divisors (10849417186).

21667313534 is a wasteful number, since it uses less digits than its factorization.

21667313534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253474.

The product of its digits is 272160, while the sum is 41.

The spelling of 21667313534 in words is "twenty-one billion, six hundred sixty-seven million, three hundred thirteen thousand, five hundred thirty-four".