2145255221 has 4 divisors (see below), whose sum is σ = 2148511200. Its totient is φ = 2141999244.

The previous prime is 2145255179. The next prime is 2145255253. The reversal of 2145255221 is 1225525412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2145255221 - 2¹⁰ = 2145254197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145255271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1627001 + ... + 1628318.

It is an arithmetic number, because the mean of its divisors is an integer number (537127800).

Almost surely, 2^2145255221 is an apocalyptic number.

It is an amenable number.

2145255221 is a deficient number, since it is larger than the sum of its proper divisors (3255979).

2145255221 is an equidigital number, since it uses as much as digits as its factorization.

2145255221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255978.

The product of its digits is 8000, while the sum is 29.

The square root of 2145255221 is about 46316.8999502341. The cubic root of 2145255221 is about 1289.7127379511.

The spelling of 2145255221 in words is "two billion, one hundred forty-five million, two hundred fifty-five thousand, two hundred twenty-one".