2145321825 has 24 divisors (see below), whose sum is σ = 3733615200. Its totient is φ = 1083951360.

The previous prime is 2145321823. The next prime is 2145321853. The reversal of 2145321825 is 5281235412.

It is not a de Polignac number, because 2145321825 - 2¹ = 2145321823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2145321821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 751320 + ... + 754169.

It is an arithmetic number, because the mean of its divisors is an integer number (155567300).

Almost surely, 2^2145321825 is an apocalyptic number.

2145321825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2145321825 is a deficient number, since it is larger than the sum of its proper divisors (1588293375).

2145321825 is a wasteful number, since it uses less digits than its factorization.

2145321825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505521 (or 1505516 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 2145321825 is about 46317.6189478691. The cubic root of 2145321825 is about 1289.7260851024.

The spelling of 2145321825 in words is "two billion, one hundred forty-five million, three hundred twenty-one thousand, eight hundred twenty-five".