2145421511 has 4 divisors (see below), whose sum is σ = 2145588192. Its totient is φ = 2145254832.

The previous prime is 2145421483. The next prime is 2145421529. The reversal of 2145421511 is 1151245412.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145421511 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 (2145421561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62255 + ... + 90368.

It is an arithmetic number, because the mean of its divisors is an integer number (536397048).

Almost surely, 2^2145421511 is an apocalyptic number.

2145421511 is a deficient number, since it is larger than the sum of its proper divisors (166681).

2145421511 is a wasteful number, since it uses less digits than its factorization.

2145421511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166680.

The product of its digits is 1600, while the sum is 26.

The square root of 2145421511 is about 46318.6950485438. The cubic root of 2145421511 is about 1289.7460612263.

Adding to 2145421511 its reverse (1151245412), we get a palindrome (3296666923).

The spelling of 2145421511 in words is "two billion, one hundred forty-five million, four hundred twenty-one thousand, five hundred eleven".