21461179 has 2 divisors, whose sum is σ = 21461180. Its totient is φ = 21461178.

The previous prime is 21461173. The next prime is 21461201. The reversal of 21461179 is 97116412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21461179 - 2¹¹ = 21459131 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21461179.

It is not a weakly prime, because it can be changed into another prime (21461173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10730589 + 10730590.

It is an arithmetic number, because the mean of its divisors is an integer number (10730590).

Almost surely, 2^21461179 is an apocalyptic number.

21461179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21461179 is an equidigital number, since it uses as much as digits as its factorization.

21461179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 21461179 is about 4632.6211802823. The cubic root of 21461179 is about 277.8974269205.

The spelling of 21461179 in words is "twenty-one million, four hundred sixty-one thousand, one hundred seventy-nine".