21454452233550 has 216 divisors, whose sum is σ = 67293814087656. Its totient is φ = 4886169886080.

The previous prime is 21454452233479. The next prime is 21454452233551. The reversal of 21454452233550 is 5533225445412.

21454452233550 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 4 + 45 + 22 + 33 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 21454452233496 and 21454452233505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454452233551) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 4351549 + ... + 7864151.

It is an arithmetic number, because the mean of its divisors is an integer number (311545435591).

Almost surely, 2^{21454452233550} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21454452233550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33646907043828).

21454452233550 is an abundant number, since it is smaller than the sum of its proper divisors (45839361854106).

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

21454452233550 is a wasteful number, since it uses less digits than its factorization.

21454452233550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512912 (or 3512897 counting only the distinct ones).

The product of its (nonzero) digits is 2880000, while the sum is 45.

Adding to 21454452233550 its reverse (5533225445412), we get a palindrome (26987677678962).

The spelling of 21454452233550 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred fifty-two million, two hundred thirty-three thousand, five hundred fifty".