21550030042225 has 6 divisors (see below), whose sum is σ = 26722037252390. Its totient is φ = 17240024033760.

The previous prime is 21550030042217. The next prime is 21550030042267. The reversal of 21550030042225 is 52224003005512.

It can be written as a sum of positive squares in 3 ways, for example, as 4990143902769 + 16559886139456 = 2233863^2 + 4069384^2 .

It is not a de Polignac number, because 21550030042225 - 2³ = 21550030042217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 431000600820 + ... + 431000600869.

Almost surely, 2^{21550030042225} is an apocalyptic number.

21550030042225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21550030042225 is a deficient number, since it is larger than the sum of its proper divisors (5172007210165).

21550030042225 is an equidigital number, since it uses as much as digits as its factorization.

21550030042225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862001201699 (or 862001201694 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 21550030042225 its reverse (52224003005512), we get a palindrome (73774033047737).

The spelling of 21550030042225 in words is "twenty-one trillion, five hundred fifty billion, thirty million, forty-two thousand, two hundred twenty-five".