21325434453 has 24 divisors (see below), whose sum is σ = 32431289280. Its totient is φ = 13465932480.

The previous prime is 21325434439. The next prime is 21325434463. The reversal of 21325434453 is 35443452312.

21325434453 is a `hidden beast` number, since 2 + 13 + 254 + 344 + 53 = 666.

It is not a de Polignac number, because 21325434453 - 2⁴ = 21325434437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325434463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1111048 + ... + 1130078.

It is an arithmetic number, because the mean of its divisors is an integer number (1351303720).

Almost surely, 2^21325434453 is an apocalyptic number.

It is an amenable number.

21325434453 is a deficient number, since it is larger than the sum of its proper divisors (11105854827).

21325434453 is a wasteful number, since it uses less digits than its factorization.

21325434453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25609 (or 25606 counting only the distinct ones).

The product of its digits is 172800, while the sum is 36.

Adding to 21325434453 its reverse (35443452312), we get a palindrome (56768886765).

The spelling of 21325434453 in words is "twenty-one billion, three hundred twenty-five million, four hundred thirty-four thousand, four hundred fifty-three".