2145024121 has 4 divisors (see below), whose sum is σ = 2218990500. Its totient is φ = 2071057744.

The previous prime is 2145024107. The next prime is 2145024127. The reversal of 2145024121 is 1214205412.

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 426009600 + 1719014521 = 20640^2 + 41461^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145024121 - 2¹⁵ = 2144991353 is a prime.

It is a super-2 number, since 2×2145024121² = 9202256959343645282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2145024092 and 2145024101.

It is not an unprimeable number, because it can be changed into a prime (2145024127) 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, 36983146 + ... + 36983203.

It is an arithmetic number, because the mean of its divisors is an integer number (554747625).

Almost surely, 2^2145024121 is an apocalyptic number.

It is an amenable number.

2145024121 is a deficient number, since it is larger than the sum of its proper divisors (73966379).

2145024121 is an equidigital number, since it uses as much as digits as its factorization.

2145024121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73966378.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 2145024121 is about 46314.4051133122. The cubic root of 2145024121 is about 1289.6664243759. Note that the first 3 decimals are identical.

Adding to 2145024121 its reverse (1214205412), we get a palindrome (3359229533).

The spelling of 2145024121 in words is "two billion, one hundred forty-five million, twenty-four thousand, one hundred twenty-one".