2101120321 has 4 divisors (see below), whose sum is σ = 2224715652. Its totient is φ = 1977524992.

The previous prime is 2101120303. The next prime is 2101120363. The reversal of 2101120321 is 1230211012.

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 1078399921 + 1022720400 = 32839^2 + 31980^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101120321 - 2¹³ = 2101112129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101120121) 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, 61797640 + ... + 61797673.

It is an arithmetic number, because the mean of its divisors is an integer number (556178913).

Almost surely, 2^2101120321 is an apocalyptic number.

It is an amenable number.

2101120321 is a deficient number, since it is larger than the sum of its proper divisors (123595331).

2101120321 is a wasteful number, since it uses less digits than its factorization.

2101120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123595330.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2101120321 is about 45837.9790239491. The cubic root of 2101120321 is about 1280.8068482704.

Adding to 2101120321 its reverse (1230211012), we get a palindrome (3331331333).

The spelling of 2101120321 in words is "two billion, one hundred one million, one hundred twenty thousand, three hundred twenty-one".