21550341320430 has 32 divisors (see below), whose sum is σ = 55699343721504. Its totient is φ = 5304699401856.

The previous prime is 21550341320377. The next prime is 21550341320441. The reversal of 21550341320430 is 3402314305512.

It is a super-2 number, since 2×21550341320430² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21550341320391 and 21550341320400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27628642329 + ... + 27628643108.

It is an arithmetic number, because the mean of its divisors is an integer number (1740604491297).

Almost surely, 2^{21550341320430} is an apocalyptic number.

21550341320430 is an abundant number, since it is smaller than the sum of its proper divisors (34149002401074).

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

21550341320430 is a wasteful number, since it uses less digits than its factorization.

21550341320430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55257285460.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 21550341320430 its reverse (3402314305512), we get a palindrome (24952655625942).

The spelling of 21550341320430 in words is "twenty-one trillion, five hundred fifty billion, three hundred forty-one million, three hundred twenty thousand, four hundred thirty".