21454450144225 has 24 divisors (see below), whose sum is σ = 30571998836288. Its totient is φ = 14630343249600.

The previous prime is 21454450144181. The next prime is 21454450144261. The reversal of 21454450144225 is 52244105445412.

It is not a de Polignac number, because 21454450144225 - 2⁷ = 21454450144097 is a prime.

It is a super-2 number, since 2×21454450144225² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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, 338633679 + ... + 338697028.

Almost surely, 2^{21454450144225} is an apocalyptic number.

21454450144225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21454450144225 is a deficient number, since it is larger than the sum of its proper divisors (9117548692063).

21454450144225 is a wasteful number, since it uses less digits than its factorization.

21454450144225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677330905 (or 677330900 counting only the distinct ones).

The product of its (nonzero) digits is 1024000, while the sum is 43.

Adding to 21454450144225 its reverse (52244105445412), we get a palindrome (73698555589637).

The spelling of 21454450144225 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred fifty million, one hundred forty-four thousand, two hundred twenty-five".