21616401522550 has 96 divisors (see below), whose sum is σ = 43059793104000. Its totient is φ = 8058847426560.

The previous prime is 21616401522533. The next prime is 21616401522673. The reversal of 21616401522550 is 5522510461612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2802426 + ... + 7147474.

It is an arithmetic number, because the mean of its divisors is an integer number (448539511500).

Almost surely, 2^{21616401522550} is an apocalyptic number.

21616401522550 is a deficient number, since it is larger than the sum of its proper divisors (21443391581450).

21616401522550 is a wasteful number, since it uses less digits than its factorization.

21616401522550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4345210 (or 4345205 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 21616401522550 in words is "twenty-one trillion, six hundred sixteen billion, four hundred one million, five hundred twenty-two thousand, five hundred fifty".