121021121 has 4 divisors (see below), whose sum is σ = 130330452. Its totient is φ = 111711792.

The previous prime is 121021111. The next prime is 121021151. The reversal of 121021121 is 121120121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47679025 + 73342096 = 6905^2 + 8564^2 .

It is a cyclic number.

It is not a de Polignac number, because 121021121 - 2⁶ = 121021057 is a prime.

It is a super-2 number, since 2×121021121² = 29292223456193282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121021111) 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 in 3 ways as a sum of consecutive naturals, for example, 4654646 + ... + 4654671.

It is an arithmetic number, because the mean of its divisors is an integer number (32582613).

Almost surely, 2^121021121 is an apocalyptic number.

It is an amenable number.

121021121 is a deficient number, since it is larger than the sum of its proper divisors (9309331).

121021121 is an equidigital number, since it uses as much as digits as its factorization.

121021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9309330.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 121021121 is about 11000.9600035633. The cubic root of 121021121 is about 494.6375212492.

Adding to 121021121 its reverse (121120121), we get a palindrome (242141242).

The spelling of 121021121 in words is "one hundred twenty-one million, twenty-one thousand, one hundred twenty-one".