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121210021 is a prime number
BaseRepresentation
bin1110011100110…
…00010010100101
322110002002220001
413032120102211
5222012210041
620005541301
73001160662
oct716302245
9273062801
10121210021
1162468979
1234714831
131c15b90a
1412152a69
15a994131
hex73984a5

121210021 has 2 divisors, whose sum is σ = 121210022. Its totient is φ = 121210020.

The previous prime is 121210007. The next prime is 121210027. The reversal of 121210021 is 120012121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65124900 + 56085121 = 8070^2 + 7489^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210021 - 215 = 121177253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605010 + 60605011.

It is an arithmetic number, because the mean of its divisors is an integer number (60605011).

Almost surely, 2121210021 is an apocalyptic number.

It is an amenable number.

121210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210021 is an equidigital number, since it uses as much as digits as its factorization.

121210021 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 121210021 is about 11009.5422702309. The cubic root of 121210021 is about 494.8947448211.

Adding to 121210021 its reverse (120012121), we get a palindrome (241222142).

It can be divided in two parts, 1212100 and 21, that added together give a palindrome (1212121).

The spelling of 121210021 in words is "one hundred twenty-one million, two hundred ten thousand, twenty-one".