21034350432 has 96 divisors (see below), whose sum is σ = 61382966400. Its totient is φ = 7007704704.

The previous prime is 21034350373. The next prime is 21034350433. The reversal of 21034350432 is 23405343012.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21034350396 and 21034350405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034350433) 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, 1953319 + ... + 1964057.

It is an arithmetic number, because the mean of its divisors is an integer number (639405900).

Almost surely, 2^21034350432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21034350432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30691483200).

21034350432 is an abundant number, since it is smaller than the sum of its proper divisors (40348615968).

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

21034350432 is a wasteful number, since it uses less digits than its factorization.

21034350432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13025 (or 13011 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

Adding to 21034350432 its reverse (23405343012), we get a palindrome (44439693444).

The spelling of 21034350432 in words is "twenty-one billion, thirty-four million, three hundred fifty thousand, four hundred thirty-two".