21450179 has 2 divisors, whose sum is σ = 21450180. Its totient is φ = 21450178.

The previous prime is 21450161. The next prime is 21450181. The reversal of 21450179 is 97105412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21450179 - 2¹² = 21446083 is a prime.

It is a super-2 number, since 2×21450179² = 920220358264082, which contains 22 as substring.

Together with 21450181, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21450119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725089 + 10725090.

It is an arithmetic number, because the mean of its divisors is an integer number (10725090).

Almost surely, 2^21450179 is an apocalyptic number.

21450179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450179 is an equidigital number, since it uses as much as digits as its factorization.

21450179 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 21450179 is about 4631.4337952733. The cubic root of 21450179 is about 277.8499397171.

The spelling of 21450179 in words is "twenty-one million, four hundred fifty thousand, one hundred seventy-nine".