21079463 has 4 divisors (see below), whose sum is σ = 21127920. Its totient is φ = 21031008.

The previous prime is 21079459. The next prime is 21079481. The reversal of 21079463 is 36497012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21079463 - 2² = 21079459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21079483) 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, 23570 + ... + 24447.

It is an arithmetic number, because the mean of its divisors is an integer number (5281980).

Almost surely, 2^21079463 is an apocalyptic number.

21079463 is a deficient number, since it is larger than the sum of its proper divisors (48457).

21079463 is an equidigital number, since it uses as much as digits as its factorization.

21079463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48456.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 21079463 is about 4591.2376327086. The cubic root of 21079463 is about 276.2399675588.

The spelling of 21079463 in words is "twenty-one million, seventy-nine thousand, four hundred sixty-three".