21054179 has 2 divisors, whose sum is σ = 21054180. Its totient is φ = 21054178.

The previous prime is 21054169. The next prime is 21054181. The reversal of 21054179 is 97145012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21054179 - 2²⁰ = 20005603 is a prime.

Together with 21054181, 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 (21054119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527089 + 10527090.

It is an arithmetic number, because the mean of its divisors is an integer number (10527090).

Almost surely, 2^21054179 is an apocalyptic number.

21054179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21054179 is an equidigital number, since it uses as much as digits as its factorization.

21054179 is an evil number, because the sum of its binary digits is even.

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

The square root of 21054179 is about 4588.4833006125. The cubic root of 21054179 is about 276.1294769875.

The spelling of 21054179 in words is "twenty-one million, fifty-four thousand, one hundred seventy-nine".