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201121021 is a prime number
BaseRepresentation
bin10111111110011…
…01110011111101
3112000110000011201
423333031303331
5402441333041
631542415501
74661333443
oct1377156375
9460400151
10201121021
11a3589222
1257431591
133288a62a
141c9d4b93
15129cb631
hexbfcdcfd

201121021 has 2 divisors, whose sum is σ = 201121022. Its totient is φ = 201121020.

The previous prime is 201121013. The next prime is 201121027. The reversal of 201121021 is 120121102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195692121 + 5428900 = 13989^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121021 - 23 = 201121013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201120989 and 201121007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201121027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560510 + 100560511.

It is an arithmetic number, because the mean of its divisors is an integer number (100560511).

Almost surely, 2201121021 is an apocalyptic number.

It is an amenable number.

201121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121021 is an equidigital number, since it uses as much as digits as its factorization.

201121021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 201121021 is about 14181.7143180929. The cubic root of 201121021 is about 585.8941409731.

Adding to 201121021 its reverse (120121102), we get a palindrome (321242123).

It can be divided in two parts, 2011 and 21021, that added together give a palindrome (23032).

The spelling of 201121021 in words is "two hundred one million, one hundred twenty-one thousand, twenty-one".