21321079671 has 8 divisors (see below), whose sum is σ = 29032959744. Its totient is φ = 13911626360.

The previous prime is 21321079667. The next prime is 21321079679. The reversal of 21321079671 is 17697012312.

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 21321079671 - 2² = 21321079667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321079679) 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, 75606525 + ... + 75606806.

It is an arithmetic number, because the mean of its divisors is an integer number (3629119968).

Almost surely, 2^21321079671 is an apocalyptic number.

21321079671 is a deficient number, since it is larger than the sum of its proper divisors (7711880073).

21321079671 is a wasteful number, since it uses less digits than its factorization.

21321079671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151213381.

The product of its (nonzero) digits is 31752, while the sum is 39.

The spelling of 21321079671 in words is "twenty-one billion, three hundred twenty-one million, seventy-nine thousand, six hundred seventy-one".