21203250450 has 96 divisors (see below), whose sum is σ = 56701995840. Its totient is φ = 5225932800.

The previous prime is 21203250413. The next prime is 21203250463. The reversal of 21203250450 is 5405230212.

It is a self number, because there is not a number n which added to its sum of digits gives 21203250450.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26122 + ... + 207578.

It is an arithmetic number, because the mean of its divisors is an integer number (590645790).

Almost surely, 2^21203250450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21203250450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28350997920).

21203250450 is an abundant number, since it is smaller than the sum of its proper divisors (35498745390).

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

21203250450 is a wasteful number, since it uses less digits than its factorization.

21203250450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181532 (or 181527 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

Adding to 21203250450 its reverse (5405230212), we get a palindrome (26608480662).

The spelling of 21203250450 in words is "twenty-one billion, two hundred three million, two hundred fifty thousand, four hundred fifty".