21671077479 has 8 divisors (see below), whose sum is σ = 28901524080. Its totient is φ = 14444007936.

The previous prime is 21671077469. The next prime is 21671077481. The reversal of 21671077479 is 97477017612.

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

It is not a de Polignac number, because 21671077479 - 2³² = 17376110183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21671077469) 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, 829252 + ... + 854985.

It is an arithmetic number, because the mean of its divisors is an integer number (3612690510).

Almost surely, 2^21671077479 is an apocalyptic number.

21671077479 is a deficient number, since it is larger than the sum of its proper divisors (7230446601).

21671077479 is a wasteful number, since it uses less digits than its factorization.

21671077479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688529.

The product of its (nonzero) digits is 1037232, while the sum is 51.

The spelling of 21671077479 in words is "twenty-one billion, six hundred seventy-one million, seventy-seven thousand, four hundred seventy-nine".