21454531331454 has 96 divisors (see below), whose sum is σ = 50249654189280. Its totient is φ = 6576468454656.

The previous prime is 21454531331437. The next prime is 21454531331473. The reversal of 21454531331454 is 45413313545412.

21454531331454 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 453 + 133 + 14 + 54 = 666.

It is a congruent number.

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, 445210749 + ... + 445258935.

It is an arithmetic number, because the mean of its divisors is an integer number (523433897805).

Almost surely, 2^{21454531331454} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21454531331454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25124827094640).

21454531331454 is an abundant number, since it is smaller than the sum of its proper divisors (28795122857826).

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

21454531331454 is a wasteful number, since it uses less digits than its factorization.

21454531331454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55354 (or 55351 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 45.

Adding to 21454531331454 its reverse (45413313545412), we get a palindrome (66867844876866).

The spelling of 21454531331454 in words is "twenty-one trillion, four hundred fifty-four billion, five hundred thirty-one million, three hundred thirty-one thousand, four hundred fifty-four".