2145123015 has 64 divisors (see below), whose sum is σ = 3968870400. Its totient is φ = 969122304.

The previous prime is 2145122999. The next prime is 2145123041. The reversal of 2145123015 is 5103215412.

It is a happy number.

It is not a de Polignac number, because 2145123015 - 2⁴ = 2145122999 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4886166 + ... + 4886604.

It is an arithmetic number, because the mean of its divisors is an integer number (62013600).

Almost surely, 2^2145123015 is an apocalyptic number.

2145123015 is a deficient number, since it is larger than the sum of its proper divisors (1823747385).

2145123015 is a wasteful number, since it uses less digits than its factorization.

2145123015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 2145123015 is about 46315.4727386000. The cubic root of 2145123015 is about 1289.6862436264.

Adding to 2145123015 its reverse (5103215412), we get a palindrome (7248338427).

The spelling of 2145123015 in words is "two billion, one hundred forty-five million, one hundred twenty-three thousand, fifteen".