2120202001021 has 4 divisors (see below), whose sum is σ = 2283294462652. Its totient is φ = 1957109539392.

The previous prime is 2120202001013. The next prime is 2120202001051. The reversal of 2120202001021 is 1201002020212.

It is a happy number.

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 290510220100 + 1829691780921 = 538990^2 + 1352661^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120202001021 - 2³ = 2120202001013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 163092461617 = 2120202001021 / (2 + 1 + 2 + 0 + 2 + 0 + 2 + 0 + 0 + 1 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120202000992 and 2120202001010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120202001051) 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, 81546230796 + ... + 81546230821.

It is an arithmetic number, because the mean of its divisors is an integer number (570823615663).

Almost surely, 2^{2120202001021} is an apocalyptic number.

It is an amenable number.

2120202001021 is a deficient number, since it is larger than the sum of its proper divisors (163092461631).

2120202001021 is a wasteful number, since it uses less digits than its factorization.

2120202001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163092461630.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2120202001021 its reverse (1201002020212), we get a palindrome (3321204021233).

The spelling of 2120202001021 in words is "two trillion, one hundred twenty billion, two hundred two million, one thousand, twenty-one".