21354321432 has 64 divisors (see below), whose sum is σ = 53745120000. Its totient is φ = 7070278784.

The previous prime is 21354321431. The next prime is 21354321433. The reversal of 21354321432 is 23412345312.

It is an interprime number because it is at equal distance from previous prime (21354321431) and next prime (21354321433).

It is a self number, because there is not a number n which added to its sum of digits gives 21354321432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354321431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6471319 + ... + 6474617.

It is an arithmetic number, because the mean of its divisors is an integer number (839767500).

Almost surely, 2^21354321432 is an apocalyptic number.

It is an amenable number.

21354321432 is an abundant number, since it is smaller than the sum of its proper divisors (32390798568).

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

21354321432 is a wasteful number, since it uses less digits than its factorization.

21354321432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5040 (or 5036 counting only the distinct ones).

The product of its digits is 17280, while the sum is 30.

Adding to 21354321432 its reverse (23412345312), we get a palindrome (44766666744).

The spelling of 21354321432 in words is "twenty-one billion, three hundred fifty-four million, three hundred twenty-one thousand, four hundred thirty-two".