2145416321 has 4 divisors (see below), whose sum is σ = 2149071792. Its totient is φ = 2141760852.

The previous prime is 2145416311. The next prime is 2145416363. The reversal of 2145416321 is 1236145412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2145416321 - 2⁶ = 2145416257 is a prime.

It is a super-2 number, since 2×2145416321² = 9205622380826350082, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145416311) 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, 1826855 + ... + 1828028.

It is an arithmetic number, because the mean of its divisors is an integer number (537267948).

Almost surely, 2^2145416321 is an apocalyptic number.

It is an amenable number.

2145416321 is a deficient number, since it is larger than the sum of its proper divisors (3655471).

2145416321 is an equidigital number, since it uses as much as digits as its factorization.

2145416321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655470.

The product of its digits is 5760, while the sum is 29.

The square root of 2145416321 is about 46318.6390236155. The cubic root of 2145416321 is about 1289.7450212150.

The spelling of 2145416321 in words is "two billion, one hundred forty-five million, four hundred sixteen thousand, three hundred twenty-one".