202121110130021 has 4 divisors (see below), whose sum is σ = 202402224331200. Its totient is φ = 201839995928844.

The previous prime is 202121110129997. The next prime is 202121110130033. The reversal of 202121110130021 is 120031011121202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202121110130021 - 2¹⁰ = 202121110128997 is a prime.

It is a super-3 number, since 3×202121110130021³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121110130321) 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, 140557099511 + ... + 140557100948.

It is an arithmetic number, because the mean of its divisors is an integer number (50600556082800).

Almost surely, 2^{202121110130021} is an apocalyptic number.

It is an amenable number.

202121110130021 is a deficient number, since it is larger than the sum of its proper divisors (281114201179).

202121110130021 is an equidigital number, since it uses as much as digits as its factorization.

202121110130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281114201178.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 202121110130021 its reverse (120031011121202), we get a palindrome (322152121251223).

The spelling of 202121110130021 in words is "two hundred two trillion, one hundred twenty-one billion, one hundred ten million, one hundred thirty thousand, twenty-one".