21232353453 has 8 divisors (see below), whose sum is σ = 29799794400. Its totient is φ = 13409907408.

The previous prime is 21232353433. The next prime is 21232353481. The reversal of 21232353453 is 35435323212.

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

It is not a de Polignac number, because 21232353453 - 2¹³ = 21232345261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232353403) 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, 186248658 + ... + 186248771.

It is an arithmetic number, because the mean of its divisors is an integer number (3724974300).

Almost surely, 2^21232353453 is an apocalyptic number.

It is an amenable number.

21232353453 is a deficient number, since it is larger than the sum of its proper divisors (8567440947).

21232353453 is a wasteful number, since it uses less digits than its factorization.

21232353453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372497451.

The product of its digits is 64800, while the sum is 33.

Adding to 21232353453 its reverse (35435323212), we get a palindrome (56667676665).

The spelling of 21232353453 in words is "twenty-one billion, two hundred thirty-two million, three hundred fifty-three thousand, four hundred fifty-three".