21477079 has 16 divisors (see below), whose sum is σ = 24111360. Its totient is φ = 18996480.

The previous prime is 21477077. The next prime is 21477089. The reversal of 21477079 is 97077412.

It is a cyclic number.

It is not a de Polignac number, because 21477079 - 2¹ = 21477077 is a prime.

It is a super-4 number, since 4×21477079⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55017 + ... + 55405.

It is an arithmetic number, because the mean of its divisors is an integer number (1506960).

Almost surely, 2^21477079 is an apocalyptic number.

21477079 is a deficient number, since it is larger than the sum of its proper divisors (2634281).

21477079 is a wasteful number, since it uses less digits than its factorization.

21477079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 21477079 is about 4634.3369536537. The cubic root of 21477079 is about 277.9660388443.

The spelling of 21477079 in words is "twenty-one million, four hundred seventy-seven thousand, seventy-nine".