2145121151 has 4 divisors (see below), whose sum is σ = 2238387312. Its totient is φ = 2051854992.

The previous prime is 2145121117. The next prime is 2145121159. The reversal of 2145121151 is 1511215412.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2145121151 - 2⁶ = 2145121087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 93266137 = 2145121151 / (2 + 1 + 4 + 5 + 1 + 2 + 1 + 1 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145121159) 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, 46633046 + ... + 46633091.

It is an arithmetic number, because the mean of its divisors is an integer number (559596828).

Almost surely, 2^2145121151 is an apocalyptic number.

2145121151 is a deficient number, since it is larger than the sum of its proper divisors (93266161).

2145121151 is an equidigital number, since it uses as much as digits as its factorization.

2145121151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93266160.

The product of its digits is 400, while the sum is 23.

The square root of 2145121151 is about 46315.4526157307. The cubic root of 2145121151 is about 1289.6858700696.

Adding to 2145121151 its reverse (1511215412), we get a palindrome (3656336563).

The spelling of 2145121151 in words is "two billion, one hundred forty-five million, one hundred twenty-one thousand, one hundred fifty-one".