21548455507338 has 16 divisors (see below), whose sum is σ = 45632023427520. Its totient is φ = 6760299766976.

The previous prime is 21548455507331. The next prime is 21548455507441. The reversal of 21548455507338 is 83370555484512.

It is not an unprimeable number, because it can be changed into a prime (21548455507331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105629683758 + ... + 105629683961.

It is an arithmetic number, because the mean of its divisors is an integer number (2852001464220).

Almost surely, 2^{21548455507338} is an apocalyptic number.

21548455507338 is an abundant number, since it is smaller than the sum of its proper divisors (24083567920182).

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

21548455507338 is a wasteful number, since it uses less digits than its factorization.

21548455507338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211259367741.

The product of its (nonzero) digits is 80640000, while the sum is 60.

The spelling of 21548455507338 in words is "twenty-one trillion, five hundred forty-eight billion, four hundred fifty-five million, five hundred seven thousand, three hundred thirty-eight".