21041214432 has 384 divisors, whose sum is σ = 69132994560. Its totient is φ = 5466685440.

The previous prime is 21041214409. The next prime is 21041214433. The reversal of 21041214432 is 23441214012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041214433) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 78219994 + ... + 78220262.

It is an arithmetic number, because the mean of its divisors is an integer number (180033840).

Almost surely, 2^21041214432 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 21041214432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34566497280).

21041214432 is an abundant number, since it is smaller than the sum of its proper divisors (48091780128).

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

21041214432 is a wasteful number, since it uses less digits than its factorization.

21041214432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21041214432 its reverse (23441214012), we get a palindrome (44482428444).

The spelling of 21041214432 in words is "twenty-one billion, forty-one million, two hundred fourteen thousand, four hundred thirty-two".