121000421 has 2 divisors, whose sum is σ = 121000422. Its totient is φ = 121000420.

The previous prime is 121000391. The next prime is 121000423. The reversal of 121000421 is 124000121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64224196 + 56776225 = 8014^2 + 7535^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000421 - 2⁶ = 121000357 is a prime.

It is a super-2 number, since 2×121000421² = 29282203764354482, which contains 22 as substring.

Together with 121000423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121000423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500210 + 60500211.

It is an arithmetic number, because the mean of its divisors is an integer number (60500211).

Almost surely, 2^121000421 is an apocalyptic number.

It is an amenable number.

121000421 is a deficient number, since it is larger than the sum of its proper divisors (1).

121000421 is an equidigital number, since it uses as much as digits as its factorization.

121000421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 121000421 is about 11000.0191363470. The cubic root of 121000421 is about 494.6093179613.

Adding to 121000421 its reverse (124000121), we get a palindrome (245000542).

The spelling of 121000421 in words is "one hundred twenty-one million, four hundred twenty-one", and thus it is an aban number.