21442020555225 has 24 divisors (see below), whose sum is σ = 35454332152512. Its totient is φ = 11434607252800.

The previous prime is 21442020555211. The next prime is 21442020555229. The reversal of 21442020555225 is 52255502024412.

It is not a de Polignac number, because 21442020555225 - 2³⁷ = 21304581601753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21442020555229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13453437 + ... + 14962586.

It is an arithmetic number, because the mean of its divisors is an integer number (1477263839688).

Almost surely, 2^{21442020555225} is an apocalyptic number.

21442020555225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21442020555225 is a deficient number, since it is larger than the sum of its proper divisors (14012311597287).

21442020555225 is a wasteful number, since it uses less digits than its factorization.

21442020555225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28426097 (or 28426092 counting only the distinct ones).

The product of its (nonzero) digits is 320000, while the sum is 39.

Adding to 21442020555225 its reverse (52255502024412), we get a palindrome (73697522579637).

The spelling of 21442020555225 in words is "twenty-one trillion, four hundred forty-two billion, twenty million, five hundred fifty-five thousand, two hundred twenty-five".