121220407 has 16 divisors (see below), whose sum is σ = 152554752. Its totient is φ = 93568320.

The previous prime is 121220401. The next prime is 121220413. The reversal of 121220407 is 704022121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121220401) and next prime (121220413).

It is a cyclic number.

It is not a de Polignac number, because 121220407 - 2¹¹ = 121218359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220401) 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 in 15 ways as a sum of consecutive naturals, for example, 883 + ... + 15595.

It is an arithmetic number, because the mean of its divisors is an integer number (9534672).

Almost surely, 2^121220407 is an apocalyptic number.

121220407 is a deficient number, since it is larger than the sum of its proper divisors (31334345).

121220407 is a wasteful number, since it uses less digits than its factorization.

121220407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14838.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 121220407 is about 11010.0139418622. The cubic root of 121220407 is about 494.9088795986.

Adding to 121220407 its reverse (704022121), we get a palindrome (825242528).

The spelling of 121220407 in words is "one hundred twenty-one million, two hundred twenty thousand, four hundred seven".