21201453 has 32 divisors (see below), whose sum is σ = 38662400. Its totient is φ = 11181888.

The previous prime is 21201449. The next prime is 21201461. The reversal of 21201453 is 35410212.

21201453 is a `hidden beast` number, since 212 + 0 + 1 + 453 = 666.

It is not a de Polignac number, because 21201453 - 2² = 21201449 is a prime.

It is a super-2 number, since 2×21201453² = 899003218622418, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1858 + ... + 6771.

It is an arithmetic number, because the mean of its divisors is an integer number (1208200).

Almost surely, 2^21201453 is an apocalyptic number.

It is an amenable number.

21201453 is a deficient number, since it is larger than the sum of its proper divisors (17460947).

21201453 is a wasteful number, since it uses less digits than its factorization.

21201453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8658 (or 8652 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21201453 is about 4604.5035563022. The cubic root of 21201453 is about 276.7718235447.

Adding to 21201453 its reverse (35410212), we get a palindrome (56611665).

The spelling of 21201453 in words is "twenty-one million, two hundred one thousand, four hundred fifty-three".