21454563432 has 32 divisors (see below), whose sum is σ = 53640000000. Its totient is φ = 7151042304.

The previous prime is 21454563419. The next prime is 21454563437. The reversal of 21454563432 is 23436545412.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21454563437) 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, 670944 + ... + 702192.

It is an arithmetic number, because the mean of its divisors is an integer number (1676250000).

Almost surely, 2^21454563432 is an apocalyptic number.

It is an amenable number.

21454563432 is an abundant number, since it is smaller than the sum of its proper divisors (32185436568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21454563432 is a wasteful number, since it uses less digits than its factorization.

21454563432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59865 (or 59861 counting only the distinct ones).

The product of its digits is 345600, while the sum is 39.

The spelling of 21454563432 in words is "twenty-one billion, four hundred fifty-four million, five hundred sixty-three thousand, four hundred thirty-two".