21454073 has 8 divisors (see below), whose sum is σ = 21825000. Its totient is φ = 21086208.

The previous prime is 21454049. The next prime is 21454087. The reversal of 21454073 is 37045412.

It can be written as a sum of positive squares in 4 ways, for example, as 44944 + 21409129 = 212^2 + 4627^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21454073 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (21454373) 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, 16553 + ... + 17801.

It is an arithmetic number, because the mean of its divisors is an integer number (2728125).

Almost surely, 2^21454073 is an apocalyptic number.

It is an amenable number.

21454073 is a deficient number, since it is larger than the sum of its proper divisors (370927).

21454073 is a wasteful number, since it uses less digits than its factorization.

21454073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 21454073 is about 4631.8541643709. The cubic root of 21454073 is about 277.8667520430.

Adding to 21454073 its reverse (37045412), we get a palindrome (58499485).

The spelling of 21454073 in words is "twenty-one million, four hundred fifty-four thousand, seventy-three".