21419171 has 8 divisors (see below), whose sum is σ = 22332288. Its totient is φ = 20520000.

The previous prime is 21419143. The next prime is 21419173. The reversal of 21419171 is 17191412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21419171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21419171.

It is not an unprimeable number, because it can be changed into a prime (21419173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290 + ... + 6551.

It is an arithmetic number, because the mean of its divisors is an integer number (2791536).

Almost surely, 2^21419171 is an apocalyptic number.

21419171 is a deficient number, since it is larger than the sum of its proper divisors (913117).

21419171 is a wasteful number, since it uses less digits than its factorization.

21419171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973.

The product of its digits is 504, while the sum is 26.

The square root of 21419171 is about 4628.0850251481. The cubic root of 21419171 is about 277.7159901625.

The spelling of 21419171 in words is "twenty-one million, four hundred nineteen thousand, one hundred seventy-one".