2145254404221 has 8 divisors (see below), whose sum is σ = 3178154672960. Its totient is φ = 1430169602796.

The previous prime is 2145254404219. The next prime is 2145254404243. The reversal of 2145254404221 is 1224044525412.

2145254404221 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 25 + 4 + 404 + 221 = 666.

It is not a de Polignac number, because 2145254404221 - 2¹ = 2145254404219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145254404291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39726933385 + ... + 39726933438.

It is an arithmetic number, because the mean of its divisors is an integer number (397269334120).

Almost surely, 2^{2145254404221} is an apocalyptic number.

It is an amenable number.

2145254404221 is a deficient number, since it is larger than the sum of its proper divisors (1032900268739).

2145254404221 is an equidigital number, since it uses as much as digits as its factorization.

2145254404221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79453866832 (or 79453866826 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 36.

Adding to 2145254404221 its reverse (1224044525412), we get a palindrome (3369298929633).

The spelling of 2145254404221 in words is "two trillion, one hundred forty-five billion, two hundred fifty-four million, four hundred four thousand, two hundred twenty-one".