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202121081 is a prime number
BaseRepresentation
bin11000000110000…
…01111101111001
3112002022210222222
430003001331321
5403220333311
632020053425
75003000201
oct1403017571
9462283888
10202121081
11a4101618
1257834275
1332b4a896
141cbb5401
1512b27adb
hexc0c1f79

202121081 has 2 divisors, whose sum is σ = 202121082. Its totient is φ = 202121080.

The previous prime is 202121063. The next prime is 202121137. The reversal of 202121081 is 180121202.

It is a happy number.

202121081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181144681 + 20976400 = 13459^2 + 4580^2 .

It is a cyclic number.

It is not a de Polignac number, because 202121081 - 214 = 202104697 is a prime.

It is a super-3 number, since 3×2021210813 (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (202121681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060540 + 101060541.

It is an arithmetic number, because the mean of its divisors is an integer number (101060541).

Almost surely, 2202121081 is an apocalyptic number.

It is an amenable number.

202121081 is a deficient number, since it is larger than the sum of its proper divisors (1).

202121081 is an equidigital number, since it uses as much as digits as its factorization.

202121081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 202121081 is about 14216.9293801439. The cubic root of 202121081 is about 586.8636414953.

Adding to 202121081 its reverse (180121202), we get a palindrome (382242283).

The spelling of 202121081 in words is "two hundred two million, one hundred twenty-one thousand, eighty-one".