21554117540102 has 96 divisors (see below), whose sum is σ = 38420966079360. Its totient is φ = 9039841816320.

The previous prime is 21554117540099. The next prime is 21554117540141. The reversal of 21554117540102 is 20104571145512.

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, 1733057828 + ... + 1733070264.

It is an arithmetic number, because the mean of its divisors is an integer number (400218396660).

Almost surely, 2^{21554117540102} is an apocalyptic number.

21554117540102 is a deficient number, since it is larger than the sum of its proper divisors (16866848539258).

21554117540102 is a wasteful number, since it uses less digits than its factorization.

21554117540102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13966 (or 13959 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 38.

Adding to 21554117540102 its reverse (20104571145512), we get a palindrome (41658688685614).

The spelling of 21554117540102 in words is "twenty-one trillion, five hundred fifty-four billion, one hundred seventeen million, five hundred forty thousand, one hundred two".