21320105342550 has 96 divisors (see below), whose sum is σ = 63054542679552. Its totient is φ = 4661290106880.

The previous prime is 21320105342533. The next prime is 21320105342639. The reversal of 21320105342550 is 5524350102312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 441385899 + ... + 441434198.

It is an arithmetic number, because the mean of its divisors is an integer number (656818152912).

Almost surely, 2^{21320105342550} is an apocalyptic number.

21320105342550 is an abundant number, since it is smaller than the sum of its proper divisors (41734437337002).

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

21320105342550 is a wasteful number, since it uses less digits than its factorization.

21320105342550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882820142 (or 882820137 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 21320105342550 its reverse (5524350102312), we get a palindrome (26844455444862).

The spelling of 21320105342550 in words is "twenty-one trillion, three hundred twenty billion, one hundred five million, three hundred forty-two thousand, five hundred fifty".