202121012102101 has 4 divisors (see below), whose sum is σ = 202124042605132. Its totient is φ = 202117981599072.

The previous prime is 202121012102071. The next prime is 202121012102147. The reversal of 202121012102101 is 101201210121202.

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 95631305323876 + 106489706778225 = 9779126^2 + 10319385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202121012102101 is a prime.

It is a super-2 number, since 2×202121012102101² (a number of 29 digits) contains 22 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 (202121012102161) 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, 1515151470 + ... + 1515284863.

It is an arithmetic number, because the mean of its divisors is an integer number (50531010651283).

Almost surely, 2^{202121012102101} is an apocalyptic number.

It is an amenable number.

202121012102101 is a deficient number, since it is larger than the sum of its proper divisors (3030503031).

202121012102101 is an equidigital number, since it uses as much as digits as its factorization.

202121012102101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030503030.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 202121012102101 its reverse (101201210121202), we get a palindrome (303322222223303).

The spelling of 202121012102101 in words is "two hundred two trillion, one hundred twenty-one billion, twelve million, one hundred two thousand, one hundred one".