21551352201440 has 48 divisors (see below), whose sum is σ = 50915352917520. Its totient is φ = 8620492907520.

The previous prime is 21551352201439. The next prime is 21551352201451. The reversal of 21551352201440 is 4410225315512.

It is a self number, because there is not a number n which added to its sum of digits gives 21551352201440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47585660 + ... + 48036420.

It is an arithmetic number, because the mean of its divisors is an integer number (1060736519115).

Almost surely, 2^{21551352201440} is an apocalyptic number.

21551352201440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21551352201440 is an abundant number, since it is smaller than the sum of its proper divisors (29364000716080).

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

21551352201440 is a wasteful number, since it uses less digits than its factorization.

21551352201440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749595 (or 749587 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 21551352201440 its reverse (4410225315512), we get a palindrome (25961577516952).

The spelling of 21551352201440 in words is "twenty-one trillion, five hundred fifty-one billion, three hundred fifty-two million, two hundred one thousand, four hundred forty".