21477243 has 8 divisors (see below), whose sum is σ = 29176848. Its totient is φ = 14047904.

The previous prime is 21477227. The next prime is 21477259. The reversal of 21477243 is 34277412.

It is an interprime number because it is at equal distance from previous prime (21477227) and next prime (21477259).

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 21477243 - 2⁴ = 21477227 is a prime.

It is a super-2 number, since 2×21477243² = 922543933762098, 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 21477243.

It is not an unprimeable number, because it can be changed into a prime (21477263) 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, 67380 + ... + 67697.

It is an arithmetic number, because the mean of its divisors is an integer number (3647106).

Almost surely, 2^21477243 is an apocalyptic number.

21477243 is a deficient number, since it is larger than the sum of its proper divisors (7699605).

21477243 is a wasteful number, since it uses less digits than its factorization.

21477243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135133.

The product of its digits is 9408, while the sum is 30.

The square root of 21477243 is about 4634.3546476289. The cubic root of 21477243 is about 277.9667463632.

The spelling of 21477243 in words is "twenty-one million, four hundred seventy-seven thousand, two hundred forty-three".