202032121021 has 4 divisors (see below), whose sum is σ = 213916363452. Its totient is φ = 190147878592.

The previous prime is 202032121007. The next prime is 202032121043. The reversal of 202032121021 is 120121230202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120121230202 = 2 ⋅60060615101.

It can be written as a sum of positive squares in 2 ways, for example, as 175703488900 + 26328632121 = 419170^2 + 162261^2 .

It is a cyclic number.

It is not a de Polignac number, because 202032121021 - 2¹¹ = 202032118973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202032120986 and 202032121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202032121121) 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, 5942121190 + ... + 5942121223.

It is an arithmetic number, because the mean of its divisors is an integer number (53479090863).

Almost surely, 2^202032121021 is an apocalyptic number.

It is an amenable number.

202032121021 is a deficient number, since it is larger than the sum of its proper divisors (11884242431).

202032121021 is a wasteful number, since it uses less digits than its factorization.

202032121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11884242430.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 202032121021 its reverse (120121230202), we get a palindrome (322153351223).

The spelling of 202032121021 in words is "two hundred two billion, thirty-two million, one hundred twenty-one thousand, twenty-one".