21454453672 has 32 divisors (see below), whose sum is σ = 40931236800. Its totient is φ = 10539656064.

The previous prime is 21454453667. The next prime is 21454453673. The reversal of 21454453672 is 27635445412.

It is not an unprimeable number, because it can be changed into a prime (21454453673) 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, 929293 + ... + 952099.

It is an arithmetic number, because the mean of its divisors is an integer number (1279101150).

Almost surely, 2^21454453672 is an apocalyptic number.

It is an amenable number.

21454453672 is a deficient number, since it is larger than the sum of its proper divisors (19476783128).

21454453672 is a wasteful number, since it uses less digits than its factorization.

21454453672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24865 (or 24861 counting only the distinct ones).

The product of its digits is 806400, while the sum is 43.

The spelling of 21454453672 in words is "twenty-one billion, four hundred fifty-four million, four hundred fifty-three thousand, six hundred seventy-two".