21479671 has 8 divisors (see below), whose sum is σ = 22654080. Its totient is φ = 20309688.

The previous prime is 21479663. The next prime is 21479693. The reversal of 21479671 is 17697412.

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

It is a cyclic number.

It is not a de Polignac number, because 21479671 - 2³ = 21479663 is a prime.

It is a super-2 number, since 2×21479671² = 922752532536482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21479671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21479371) 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, 15030 + ... + 16396.

It is an arithmetic number, because the mean of its divisors is an integer number (2831760).

Almost surely, 2^21479671 is an apocalyptic number.

21479671 is a deficient number, since it is larger than the sum of its proper divisors (1174409).

21479671 is a wasteful number, since it uses less digits than its factorization.

21479671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213.

The product of its digits is 21168, while the sum is 37.

The square root of 21479671 is about 4634.6165968718. The cubic root of 21479671 is about 277.9772206720.

The spelling of 21479671 in words is "twenty-one million, four hundred seventy-nine thousand, six hundred seventy-one".