21550210050 has 48 divisors (see below), whose sum is σ = 53488888992. Its totient is φ = 5741952000.

The previous prime is 21550210049. The next prime is 21550210057. The reversal of 21550210050 is 5001205512.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21550209999 and 21550210026.

It is not an unprimeable number, because it can be changed into a prime (21550210057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123525 + ... + 241575.

It is an arithmetic number, because the mean of its divisors is an integer number (1114351854).

Almost surely, 2^21550210050 is an apocalyptic number.

21550210050 is an abundant number, since it is smaller than the sum of its proper divisors (31938678942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21550210050 is a wasteful number, since it uses less digits than its factorization.

21550210050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119283 (or 119278 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

Adding to 21550210050 its reverse (5001205512), we get a palindrome (26551415562).

The spelling of 21550210050 in words is "twenty-one billion, five hundred fifty million, two hundred ten thousand, fifty".