21271479 has 8 divisors (see below), whose sum is σ = 28511232. Its totient is φ = 14106360.

The previous prime is 21271451. The next prime is 21271483. The reversal of 21271479 is 97417212.

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

It is not a de Polignac number, because 21271479 - 2⁷ = 21271351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21271409) 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 in 7 ways as a sum of consecutive naturals, for example, 17989 + ... + 19134.

It is an arithmetic number, because the mean of its divisors is an integer number (3563904).

Almost surely, 2^21271479 is an apocalyptic number.

21271479 is a deficient number, since it is larger than the sum of its proper divisors (7239753).

21271479 is a wasteful number, since it uses less digits than its factorization.

21271479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37317.

The product of its digits is 7056, while the sum is 33.

The square root of 21271479 is about 4612.1013648878. The cubic root of 21271479 is about 277.0762040163.

The spelling of 21271479 in words is "twenty-one million, two hundred seventy-one thousand, four hundred seventy-nine".