2152123321 has 4 divisors (see below), whose sum is σ = 2226334500. Its totient is φ = 2077912144.

The previous prime is 2152123301. The next prime is 2152123327. The reversal of 2152123321 is 1233212512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 830073721 + 1322049600 = 28811^2 + 36360^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152123321 - 2²¹ = 2150026169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2152123292 and 2152123301.

It is not an unprimeable number, because it can be changed into a prime (2152123327) 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, 37105546 + ... + 37105603.

It is an arithmetic number, because the mean of its divisors is an integer number (556583625).

Almost surely, 2^2152123321 is an apocalyptic number.

It is an amenable number.

2152123321 is a deficient number, since it is larger than the sum of its proper divisors (74211179).

2152123321 is an equidigital number, since it uses as much as digits as its factorization.

2152123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74211178.

The product of its digits is 720, while the sum is 22.

The square root of 2152123321 is about 46390.9831863909. The cubic root of 2152123321 is about 1291.0876232990.

Adding to 2152123321 its reverse (1233212512), we get a palindrome (3385335833).

The spelling of 2152123321 in words is "two billion, one hundred fifty-two million, one hundred twenty-three thousand, three hundred twenty-one".