2121320345 has 8 divisors (see below), whose sum is σ = 2547337920. Its totient is φ = 1695887280.

The previous prime is 2121320309. The next prime is 2121320347. The reversal of 2121320345 is 5430231212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2121320345 - 2²² = 2117126041 is a prime.

It is a super-2 number, since 2×2121320345² = 9000000012221838050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2121320345.

It is not an unprimeable number, because it can be changed into a prime (2121320347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138101 + ... + 152690.

It is an arithmetic number, because the mean of its divisors is an integer number (318417240).

Almost surely, 2^2121320345 is an apocalyptic number.

It is an amenable number.

2121320345 is a deficient number, since it is larger than the sum of its proper divisors (426017575).

2121320345 is a wasteful number, since it uses less digits than its factorization.

2121320345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292255.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 2121320345 is about 46057.7935316055. The cubic root of 2121320345 is about 1284.8982937161.

Adding to 2121320345 its reverse (5430231212), we get a palindrome (7551551557).

The spelling of 2121320345 in words is "two billion, one hundred twenty-one million, three hundred twenty thousand, three hundred forty-five".