121220121 has 8 divisors (see below), whose sum is σ = 176320224. Its totient is φ = 73466720.

The previous prime is 121220117. The next prime is 121220147. The reversal of 121220121 is 121022121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121220121 - 2² = 121220117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121220097 and 121220106.

It is not an unprimeable number, because it can be changed into a prime (121220101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1836636 + ... + 1836701.

It is an arithmetic number, because the mean of its divisors is an integer number (22040028).

Almost surely, 2^121220121 is an apocalyptic number.

121220121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121220121 is a deficient number, since it is larger than the sum of its proper divisors (55100103).

121220121 is a wasteful number, since it uses less digits than its factorization.

121220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673351.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 121220121 is about 11010.0009536784. Note that the first 3 decimals coincide. The cubic root of 121220121 is about 494.9084903790.

Adding to 121220121 its reverse (121022121), we get a palindrome (242242242).

The spelling of 121220121 in words is "one hundred twenty-one million, two hundred twenty thousand, one hundred twenty-one".