2102001221021 has 16 divisors (see below), whose sum is σ = 2289949584384. Its totient is φ = 1917897295104.

The previous prime is 2102001221017. The next prime is 2102001221039. The reversal of 2102001221021 is 1201221002012.

It is a cyclic number.

It is not a de Polignac number, because 2102001221021 - 2² = 2102001221017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102001220987 and 2102001221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102001221011) 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, 1410341 + ... + 2488586.

It is an arithmetic number, because the mean of its divisors is an integer number (143121849024).

Almost surely, 2^{2102001221021} is an apocalyptic number.

It is an amenable number.

2102001221021 is a deficient number, since it is larger than the sum of its proper divisors (187948363363).

2102001221021 is a wasteful number, since it uses less digits than its factorization.

2102001221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3899420.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2102001221021 its reverse (1201221002012), we get a palindrome (3303222223033).

The spelling of 2102001221021 in words is "two trillion, one hundred two billion, one million, two hundred twenty-one thousand, twenty-one".