202121 has 2 divisors, whose sum is σ = 202122. Its totient is φ = 202120.
The previous prime is 202109. The next prime is 202127. The reversal of 202121 is 121202.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 198025 + 4096 = 445^2 + 64^2 .
It is a cyclic number.
It is not a de Polignac number, because 202121 - 214 = 185737 is a prime.
It is a Chen prime.
It is a junction number, because it is equal to n+sod(n) for n = 202099 and 202108.
It is not a weakly prime, because it can be changed into another prime (202127) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060 + 101061.
It is an arithmetic number, because the mean of its divisors is an integer number (101061).
2202121 is an apocalyptic number.
It is an amenable number.
202121 is a deficient number, since it is larger than the sum of its proper divisors (1).
202121 is an equidigital number, since it uses as much as digits as its factorization.
202121 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 8, while the sum is 8.
The square root of 202121 is about 449.5786916659. The cubic root of 202121 is about 58.6863563100.
Adding to 202121 its reverse (121202), we get a palindrome (323323).
It can be divided in two parts, 202 and 121, that multiplied together give a palindrome (24442).
The spelling of 202121 in words is "two hundred two thousand, one hundred twenty-one", and thus it is an iban number.
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