21321222464550 has 48 divisors (see below), whose sum is σ = 53389997107200. Its totient is φ = 5630458743840.

The previous prime is 21321222464527. The next prime is 21321222464561. The reversal of 21321222464550 is 5546422212312.

It is a junction number, because it is equal to n+sod(n) for n = 21321222464499 and 21321222464508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 689991750 + ... + 690022649.

It is an arithmetic number, because the mean of its divisors is an integer number (1112291606400).

Almost surely, 2^{21321222464550} is an apocalyptic number.

21321222464550 is an abundant number, since it is smaller than the sum of its proper divisors (32068774642650).

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

21321222464550 is a wasteful number, since it uses less digits than its factorization.

21321222464550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380014517 (or 1380014512 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 39.

Adding to 21321222464550 its reverse (5546422212312), we get a palindrome (26867644676862).

The spelling of 21321222464550 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred twenty-two million, four hundred sixty-four thousand, five hundred fifty".