2100021321 has 8 divisors (see below), whose sum is σ = 2875705024. Its totient is φ = 1362175920.

The previous prime is 2100021317. The next prime is 2100021323. The reversal of 2100021321 is 1231200012.

2100021321 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2100021321 - 2² = 2100021317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100021297 and 2100021306.

It is not an unprimeable number, because it can be changed into a prime (2100021323) 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, 9459445 + ... + 9459666.

It is an arithmetic number, because the mean of its divisors is an integer number (359463128).

Almost surely, 2^2100021321 is an apocalyptic number.

It is an amenable number.

2100021321 is a deficient number, since it is larger than the sum of its proper divisors (775683703).

2100021321 is a wasteful number, since it uses less digits than its factorization.

2100021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18919151.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2100021321 is about 45825.9895801498. The cubic root of 2100021321 is about 1280.5834988186.

Adding to 2100021321 its reverse (1231200012), we get a palindrome (3331221333).

The spelling of 2100021321 in words is "two billion, one hundred million, twenty-one thousand, three hundred twenty-one".