202001022021121 has 4 divisors (see below), whose sum is σ = 204001032140244. Its totient is φ = 200001011902000.

The previous prime is 202001022021101. The next prime is 202001022021143. The reversal of 202001022021121 is 121120220100202.

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 101231045540496 + 100769976480625 = 10061364^2 + 10038425^2 .

It is a cyclic number.

It is not a de Polignac number, because 202001022021121 - 2¹¹ = 202001022019073 is a prime.

It is a super-2 number, since 2×202001022021121² (a number of 29 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 = 202001022021095 and 202001022021104.

It is not an unprimeable number, because it can be changed into a prime (202001022021101) 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, 1000005059410 + ... + 1000005059611.

It is an arithmetic number, because the mean of its divisors is an integer number (51000258035061).

Almost surely, 2^{202001022021121} is an apocalyptic number.

It is an amenable number.

202001022021121 is a deficient number, since it is larger than the sum of its proper divisors (2000010119123).

202001022021121 is a wasteful number, since it uses less digits than its factorization.

202001022021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000010119122.

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

Adding to 202001022021121 its reverse (121120220100202), we get a palindrome (323121242121323).

The spelling of 202001022021121 in words is "two hundred two trillion, one billion, twenty-two million, twenty-one thousand, one hundred twenty-one".