2021202021121 has 16 divisors (see below), whose sum is σ = 2037169197648. Its totient is φ = 2005287731200.

The previous prime is 2021202021119. The next prime is 2021202021133. The reversal of 2021202021121 is 1211202021202.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 578474330625 + 1442727690496 = 760575^2 + 1201136^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021202021121 - 2¹ = 2021202021119 is a prime.

It is a super-2 number, since 2×2021202021121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021202021095 and 2021202021104.

It is not an unprimeable number, because it can be changed into a prime (2021202321121) 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, 268024611 + ... + 268032151.

It is an arithmetic number, because the mean of its divisors is an integer number (127323074853).

Almost surely, 2^{2021202021121} is an apocalyptic number.

It is an amenable number.

2021202021121 is a deficient number, since it is larger than the sum of its proper divisors (15967176527).

2021202021121 is a wasteful number, since it uses less digits than its factorization.

2021202021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10772.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2021202021121 its reverse (1211202021202), we get a palindrome (3232404042323).

The spelling of 2021202021121 in words is "two trillion, twenty-one billion, two hundred two million, twenty-one thousand, one hundred twenty-one".