121021107 has 4 divisors (see below), whose sum is σ = 161361480. Its totient is φ = 80680736.

The previous prime is 121021097. The next prime is 121021111. The reversal of 121021107 is 701120121.

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

It is a cyclic number.

It is not a de Polignac number, because 121021107 - 2⁴ = 121021091 is a prime.

It is a super-2 number, since 2×121021107² = 29292216679010898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121021157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20170182 + ... + 20170187.

It is an arithmetic number, because the mean of its divisors is an integer number (40340370).

Almost surely, 2^121021107 is an apocalyptic number.

121021107 is a deficient number, since it is larger than the sum of its proper divisors (40340373).

121021107 is an equidigital number, since it uses as much as digits as its factorization.

121021107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40340372.

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 121021107 is about 11000.9593672552. The cubic root of 121021107 is about 494.6375021756.

Adding to 121021107 its reverse (701120121), we get a palindrome (822141228).

The spelling of 121021107 in words is "one hundred twenty-one million, twenty-one thousand, one hundred seven".