21101473 has 8 divisors (see below), whose sum is σ = 22242600. Its totient is φ = 19987968.

The previous prime is 21101461. The next prime is 21101503. The reversal of 21101473 is 37410112.

It can be written as a sum of positive squares in 4 ways, for example, as 4028049 + 17073424 = 2007^2 + 4132^2 .

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 21101473 - 2⁵ = 21101441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101473.

It is not an unprimeable number, because it can be changed into a prime (21101273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5328 + ... + 8401.

It is an arithmetic number, because the mean of its divisors is an integer number (2780325).

Almost surely, 2^21101473 is an apocalyptic number.

It is an amenable number.

21101473 is a deficient number, since it is larger than the sum of its proper divisors (1141127).

21101473 is a wasteful number, since it uses less digits than its factorization.

21101473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13811.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21101473 is about 4593.6339645209. The cubic root of 21101473 is about 276.3360789061.

Adding to 21101473 its reverse (37410112), we get a palindrome (58511585).

The spelling of 21101473 in words is "twenty-one million, one hundred one thousand, four hundred seventy-three".