21475743 has 8 divisors (see below), whose sum is σ = 30318768. Its totient is φ = 13474944.

The previous prime is 21475733. The next prime is 21475771. The reversal of 21475743 is 34757412.

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

It is not a de Polignac number, because 21475743 - 2⁶ = 21475679 is a prime.

It is a super-2 number, since 2×21475743² = 922415074804098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475723) 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, 210496 + ... + 210597.

It is an arithmetic number, because the mean of its divisors is an integer number (3789846).

Almost surely, 2^21475743 is an apocalyptic number.

21475743 is a deficient number, since it is larger than the sum of its proper divisors (8843025).

21475743 is a wasteful number, since it uses less digits than its factorization.

21475743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421113.

The product of its digits is 23520, while the sum is 33.

The square root of 21475743 is about 4634.1928099724. The cubic root of 21475743 is about 277.9602750201.

It can be divided in two parts, 214 and 75743, that added together give a palindrome (75957).

The spelling of 21475743 in words is "twenty-one million, four hundred seventy-five thousand, seven hundred forty-three".