21063432453 has 128 divisors (see below), whose sum is σ = 36097228800. Its totient is φ = 10657785600.

The previous prime is 21063432451. The next prime is 21063432461. The reversal of 21063432453 is 35423436012.

It is a happy number.

It is not a de Polignac number, because 21063432453 - 2¹ = 21063432451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21063432451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 77724708 + ... + 77724978.

It is an arithmetic number, because the mean of its divisors is an integer number (282009600).

Almost surely, 2^21063432453 is an apocalyptic number.

21063432453 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21063432453 is a deficient number, since it is larger than the sum of its proper divisors (15033796347).

21063432453 is a wasteful number, since it uses less digits than its factorization.

21063432453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543.

The product of its (nonzero) digits is 51840, while the sum is 33.

Adding to 21063432453 its reverse (35423436012), we get a palindrome (56486868465).

The spelling of 21063432453 in words is "twenty-one billion, sixty-three million, four hundred thirty-two thousand, four hundred fifty-three".