121010921 has 2 divisors, whose sum is σ = 121010922. Its totient is φ = 121010920.

The previous prime is 121010917. The next prime is 121010927. The reversal of 121010921 is 129010121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115885225 + 5125696 = 10765^2 + 2264^2 .

It is a cyclic number.

It is not a de Polignac number, because 121010921 - 2² = 121010917 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 121010921.

It is not a weakly prime, because it can be changed into another prime (121010927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505460 + 60505461.

It is an arithmetic number, because the mean of its divisors is an integer number (60505461).

Almost surely, 2^121010921 is an apocalyptic number.

It is an amenable number.

121010921 is a deficient number, since it is larger than the sum of its proper divisors (1).

121010921 is an equidigital number, since it uses as much as digits as its factorization.

121010921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 121010921 is about 11000.4963978904. The cubic root of 121010921 is about 494.6236243789.

The spelling of 121010921 in words is "one hundred twenty-one million, ten thousand, nine hundred twenty-one".