21600479 has 2 divisors, whose sum is σ = 21600480. Its totient is φ = 21600478.

The previous prime is 21600463. The next prime is 21600487. The reversal of 21600479 is 97400612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21600479 - 2⁴ = 21600463 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21600419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800239 + 10800240.

It is an arithmetic number, because the mean of its divisors is an integer number (10800240).

Almost surely, 2^21600479 is an apocalyptic number.

21600479 is a deficient number, since it is larger than the sum of its proper divisors (1).

21600479 is an equidigital number, since it uses as much as digits as its factorization.

21600479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 21600479 is about 4647.6315473583. The cubic root of 21600479 is about 278.4973886322.

The spelling of 21600479 in words is "twenty-one million, six hundred thousand, four hundred seventy-nine".