202130212021 has 4 divisors (see below), whose sum is σ = 202204719052. Its totient is φ = 202055704992.

The previous prime is 202130211991. The next prime is 202130212069. The reversal of 202130212021 is 120212031202.

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 199621304100 + 2508907921 = 446790^2 + 50089^2 .

It is a cyclic number.

It is not a de Polignac number, because 202130212021 - 2¹¹ = 202130209973 is a prime.

It is a super-4 number, since 4×202130212021⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202130211986 and 202130212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202130212321) 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, 37249446 + ... + 37254871.

It is an arithmetic number, because the mean of its divisors is an integer number (50551179763).

Almost surely, 2^202130212021 is an apocalyptic number.

It is an amenable number.

202130212021 is a deficient number, since it is larger than the sum of its proper divisors (74507031).

202130212021 is an equidigital number, since it uses as much as digits as its factorization.

202130212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74507030.

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

Adding to 202130212021 its reverse (120212031202), we get a palindrome (322342243223).

The spelling of 202130212021 in words is "two hundred two billion, one hundred thirty million, two hundred twelve thousand, twenty-one".