2145123114505 has 48 divisors (see below), whose sum is σ = 3009685144320. Its totient is φ = 1463450744448.

The previous prime is 2145123114499. The next prime is 2145123114509. The reversal of 2145123114505 is 5054113215412.

It is not a de Polignac number, because 2145123114505 - 2¹⁹ = 2145122590217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2145123114509) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81170724 + ... + 81197146.

It is an arithmetic number, because the mean of its divisors is an integer number (62701773840).

Almost surely, 2^{2145123114505} is an apocalyptic number.

It is an amenable number.

2145123114505 is a deficient number, since it is larger than the sum of its proper divisors (864562029815).

2145123114505 is a wasteful number, since it uses less digits than its factorization.

2145123114505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28118 (or 28111 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 2145123114505 its reverse (5054113215412), we get a palindrome (7199236329917).

The spelling of 2145123114505 in words is "two trillion, one hundred forty-five billion, one hundred twenty-three million, one hundred fourteen thousand, five hundred five".