2021202002021 has 4 divisors (see below), whose sum is σ = 2140096237452. Its totient is φ = 1902307766592.

The previous prime is 2021202001913. The next prime is 2021202002023. The reversal of 2021202002021 is 1202002021202.

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 1104682979521 + 916519022500 = 1051039^2 + 957350^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021202002021 - 2³⁸ = 1746324095077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021202001987 and 2021202002005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021202002023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59447117690 + ... + 59447117723.

It is an arithmetic number, because the mean of its divisors is an integer number (535024059363).

Almost surely, 2^{2021202002021} is an apocalyptic number.

It is an amenable number.

2021202002021 is a deficient number, since it is larger than the sum of its proper divisors (118894235431).

2021202002021 is a wasteful number, since it uses less digits than its factorization.

2021202002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118894235430.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 2021202002021 its reverse (1202002021202), we get a palindrome (3223204023223).

It can be divided in two parts, 202 and 1202002021, that multiplied together give a palindrome (242804408242).

The spelling of 2021202002021 in words is "two trillion, twenty-one billion, two hundred two million, two thousand, twenty-one".