21479277 has 8 divisors (see below), whose sum is σ = 29413216. Its totient is φ = 13932432.

The previous prime is 21479251. The next prime is 21479281. The reversal of 21479277 is 77297412.

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

It is not a de Polignac number, because 21479277 - 2¹⁰ = 21478253 is a prime.

It is a super-2 number, since 2×21479277² = 922718680885458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21479377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96643 + ... + 96864.

It is an arithmetic number, because the mean of its divisors is an integer number (3676652).

Almost surely, 2^21479277 is an apocalyptic number.

It is an amenable number.

21479277 is a deficient number, since it is larger than the sum of its proper divisors (7933939).

21479277 is a wasteful number, since it uses less digits than its factorization.

21479277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193547.

The product of its digits is 49392, while the sum is 39.

The square root of 21479277 is about 4634.5740904640. The cubic root of 21479277 is about 277.9755210232.

The spelling of 21479277 in words is "twenty-one million, four hundred seventy-nine thousand, two hundred seventy-seven".