21553541440122 has 8 divisors (see below), whose sum is σ = 43107082880256. Its totient is φ = 7184513813372.

The previous prime is 21553541440121. The next prime is 21553541440231. The reversal of 21553541440122 is 22104414535512.

It is a sphenic number, since it is the product of 3 distinct primes.

21553541440122 is an admirable number.

It is a super-2 number, since 2×21553541440122² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21553541440121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1796128453338 + ... + 1796128453349.

It is an arithmetic number, because the mean of its divisors is an integer number (5388385360032).

Almost surely, 2^{21553541440122} is an apocalyptic number.

21553541440122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21553541440122 is a wasteful number, since it uses less digits than its factorization.

21553541440122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3592256906692.

The product of its (nonzero) digits is 192000, while the sum is 39.

Adding to 21553541440122 its reverse (22104414535512), we get a palindrome (43657955975634).

The spelling of 21553541440122 in words is "twenty-one trillion, five hundred fifty-three billion, five hundred forty-one million, four hundred forty thousand, one hundred twenty-two".