21203896824 has 320 divisors, whose sum is σ = 68068598400. Its totient is φ = 6107270400.

The previous prime is 21203896807. The next prime is 21203896829. The reversal of 21203896824 is 42869830212.

It is a self number, because there is not a number n which added to its sum of digits gives 21203896824.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203896829) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 13848939 + ... + 13850469.

It is an arithmetic number, because the mean of its divisors is an integer number (212714370).

Almost surely, 2^21203896824 is an apocalyptic number.

21203896824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21203896824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34034299200).

21203896824 is an abundant number, since it is smaller than the sum of its proper divisors (46864701576).

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

21203896824 is a wasteful number, since it uses less digits than its factorization.

21203896824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656 (or 1643 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 21203896824 in words is "twenty-one billion, two hundred three million, eight hundred ninety-six thousand, eight hundred twenty-four".