21335235450 has 192 divisors, whose sum is σ = 57305760768. Its totient is φ = 5233536000.

The previous prime is 21335235421. The next prime is 21335235463. The reversal of 21335235450 is 5453253312.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25797937 + ... + 25798763.

It is an arithmetic number, because the mean of its divisors is an integer number (298467504).

Almost surely, 2^21335235450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21335235450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28652880384).

21335235450 is an abundant number, since it is smaller than the sum of its proper divisors (35970525318).

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

21335235450 is a wasteful number, since it uses less digits than its factorization.

21335235450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1072 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 33.

Adding to 21335235450 its reverse (5453253312), we get a palindrome (26788488762).

The spelling of 21335235450 in words is "twenty-one billion, three hundred thirty-five million, two hundred thirty-five thousand, four hundred fifty".