2102021321 has 16 divisors (see below), whose sum is σ = 2248466688. Its totient is φ = 1958208000.

The previous prime is 2102021303. The next prime is 2102021329. The reversal of 2102021321 is 1231202012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2102021321 - 2²⁶ = 2034912457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102021296 and 2102021305.

It is not an unprimeable number, because it can be changed into a prime (2102021329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 797021 + ... + 799653.

It is an arithmetic number, because the mean of its divisors is an integer number (140529168).

Almost surely, 2^2102021321 is an apocalyptic number.

It is an amenable number.

2102021321 is a deficient number, since it is larger than the sum of its proper divisors (146445367).

2102021321 is a wasteful number, since it uses less digits than its factorization.

2102021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2102021321 is about 45847.8060652852. The cubic root of 2102021321 is about 1280.9899001475.

Adding to 2102021321 its reverse (1231202012), we get a palindrome (3333223333).

The spelling of 2102021321 in words is "two billion, one hundred two million, twenty-one thousand, three hundred twenty-one".