21452221350 has 144 divisors (see below), whose sum is σ = 66485173248. Its totient is φ = 4857462720.

The previous prime is 21452221229. The next prime is 21452221363. The reversal of 21452221350 is 5312225412.

21452221350 is a `hidden beast` number, since 2 + 1 + 4 + 522 + 2 + 135 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 305227 + ... + 368873.

It is an arithmetic number, because the mean of its divisors is an integer number (461702592).

Almost surely, 2^21452221350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21452221350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33242586624).

21452221350 is an abundant number, since it is smaller than the sum of its proper divisors (45032951898).

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

21452221350 is a wasteful number, since it uses less digits than its factorization.

21452221350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63779 (or 63771 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21452221350 its reverse (5312225412), we get a palindrome (26764446762).

The spelling of 21452221350 in words is "twenty-one billion, four hundred fifty-two million, two hundred twenty-one thousand, three hundred fifty".