202120202121 has 8 divisors (see below), whose sum is σ = 269497121664. Its totient is φ = 134745042000.

The previous prime is 202120202111. The next prime is 202120202143. The reversal of 202120202121 is 121202021202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 202120202121 - 2¹⁴ = 202120185737 is a prime.

It is a super-2 number, since 2×202120202121² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 202120202121.

It is not an unprimeable number, because it can be changed into a prime (202120202111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143226 + ... + 651731.

It is an arithmetic number, because the mean of its divisors is an integer number (33687140208).

Almost surely, 2^202120202121 is an apocalyptic number.

It is an amenable number.

202120202121 is a deficient number, since it is larger than the sum of its proper divisors (67376919543).

202120202121 is an equidigital number, since it uses as much as digits as its factorization.

202120202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879711.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 202120202121 its reverse (121202021202), we get a palindrome (323322223323).

The spelling of 202120202121 in words is "two hundred two billion, one hundred twenty million, two hundred two thousand, one hundred twenty-one".