2145450121 has 4 divisors (see below), whose sum is σ = 2151202372. Its totient is φ = 2139697872.

The previous prime is 2145450107. The next prime is 2145450149. The reversal of 2145450121 is 1210545412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1521000000 + 624450121 = 39000^2 + 24989^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145450121 - 2⁷ = 2145449993 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145450521) 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, 2875566 + ... + 2876311.

It is an arithmetic number, because the mean of its divisors is an integer number (537800593).

Almost surely, 2^2145450121 is an apocalyptic number.

It is an amenable number.

2145450121 is a deficient number, since it is larger than the sum of its proper divisors (5752251).

2145450121 is an equidigital number, since it uses as much as digits as its factorization.

2145450121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5752250.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 2145450121 is about 46319.0038860941. The cubic root of 2145450121 is about 1289.7517942831.

Adding to 2145450121 its reverse (1210545412), we get a palindrome (3355995533).

The spelling of 2145450121 in words is "two billion, one hundred forty-five million, four hundred fifty thousand, one hundred twenty-one".