21471350443544 has 16 divisors (see below), whose sum is σ = 42377665349400. Its totient is φ = 10170639683712.

The previous prime is 21471350443541. The next prime is 21471350443577. The reversal of 21471350443544 is 44534405317412.

It is a happy number.

It is a super-2 number, since 2×21471350443544² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471350443541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70629442097 + ... + 70629442400.

Almost surely, 2^{21471350443544} is an apocalyptic number.

It is an amenable number.

21471350443544 is a deficient number, since it is larger than the sum of its proper divisors (20906314905856).

21471350443544 is a wasteful number, since it uses less digits than its factorization.

21471350443544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141258884522 (or 141258884518 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 47.

The spelling of 21471350443544 in words is "twenty-one trillion, four hundred seventy-one billion, three hundred fifty million, four hundred forty-three thousand, five hundred forty-four".