21616294550 has 24 divisors (see below), whose sum is σ = 40252977216. Its totient is φ = 8636481440.

The previous prime is 21616294541. The next prime is 21616294571. The reversal of 21616294550 is 5549261612.

It is a junction number, because it is equal to n+sod(n) for n = 21616294498 and 21616294507.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207329 + ... + 293628.

It is an arithmetic number, because the mean of its divisors is an integer number (1677207384).

Almost surely, 2^21616294550 is an apocalyptic number.

21616294550 is a deficient number, since it is larger than the sum of its proper divisors (18636682666).

21616294550 is a wasteful number, since it uses less digits than its factorization.

21616294550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501832 (or 501827 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 21616294550 in words is "twenty-one billion, six hundred sixteen million, two hundred ninety-four thousand, five hundred fifty".