21310050550 has 24 divisors (see below), whose sum is σ = 39659164776. Its totient is φ = 8519187840.

The previous prime is 21310050527. The next prime is 21310050577. The reversal of 21310050550 is 5505001312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31072 + ... + 208771.

It is an arithmetic number, because the mean of its divisors is an integer number (1652465199).

Almost surely, 2^21310050550 is an apocalyptic number.

21310050550 is a deficient number, since it is larger than the sum of its proper divisors (18349114226).

21310050550 is a wasteful number, since it uses less digits than its factorization.

21310050550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241632 (or 241627 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

Adding to 21310050550 its reverse (5505001312), we get a palindrome (26815051862).

The spelling of 21310050550 in words is "twenty-one billion, three hundred ten million, fifty thousand, five hundred fifty".