21131453 has 8 divisors (see below), whose sum is σ = 24235008. Its totient is φ = 18049104.

The previous prime is 21131449. The next prime is 21131489. The reversal of 21131453 is 35413112.

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 21131453 - 2² = 21131449 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131423) 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, 3101 + ... + 7202.

It is an arithmetic number, because the mean of its divisors is an integer number (3029376).

Almost surely, 2^21131453 is an apocalyptic number.

It is an amenable number.

21131453 is a deficient number, since it is larger than the sum of its proper divisors (3103555).

21131453 is a wasteful number, since it uses less digits than its factorization.

21131453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10603.

The product of its digits is 360, while the sum is 20.

The square root of 21131453 is about 4596.8960179669. The cubic root of 21131453 is about 276.4668854979.

Adding to 21131453 its reverse (35413112), we get a palindrome (56544565).

The spelling of 21131453 in words is "twenty-one million, one hundred thirty-one thousand, four hundred fifty-three".