21485453 has 8 divisors (see below), whose sum is σ = 23472480. Its totient is φ = 19504080.

The previous prime is 21485437. The next prime is 21485489. The reversal of 21485453 is 35458412.

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 21485453 - 2⁴ = 21485437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21485413) 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, 12818 + ... + 14396.

It is an arithmetic number, because the mean of its divisors is an integer number (2934060).

Almost surely, 2^21485453 is an apocalyptic number.

It is an amenable number.

21485453 is a deficient number, since it is larger than the sum of its proper divisors (1987027).

21485453 is a wasteful number, since it uses less digits than its factorization.

21485453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2827.

The product of its digits is 19200, while the sum is 32.

The square root of 21485453 is about 4635.2403389684. The cubic root of 21485453 is about 278.0021608444.

The spelling of 21485453 in words is "twenty-one million, four hundred eighty-five thousand, four hundred fifty-three".