21860479 has 2 divisors, whose sum is σ = 21860480. Its totient is φ = 21860478.

The previous prime is 21860477. The next prime is 21860483. The reversal of 21860479 is 97406812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21860479 - 2¹ = 21860477 is a prime.

Together with 21860477, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21860471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10930239 + 10930240.

It is an arithmetic number, because the mean of its divisors is an integer number (10930240).

Almost surely, 2^21860479 is an apocalyptic number.

21860479 is a deficient number, since it is larger than the sum of its proper divisors (1).

21860479 is an equidigital number, since it uses as much as digits as its factorization.

21860479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 21860479 is about 4675.5191155635. The cubic root of 21860479 is about 279.6103380807.

The spelling of 21860479 in words is "twenty-one million, eight hundred sixty thousand, four hundred seventy-nine".