121405207 has 32 divisors (see below), whose sum is σ = 157667328. Its totient is φ = 90720000.

The previous prime is 121405199. The next prime is 121405217. The reversal of 121405207 is 702504121.

It is a happy number.

It is not a de Polignac number, because 121405207 - 2³ = 121405199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121405217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 431907 + ... + 432187.

It is an arithmetic number, because the mean of its divisors is an integer number (4927104).

Almost surely, 2^121405207 is an apocalyptic number.

121405207 is a deficient number, since it is larger than the sum of its proper divisors (36262121).

121405207 is a wasteful number, since it uses less digits than its factorization.

121405207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 121405207 is about 11018.4031057136. The cubic root of 121405207 is about 495.1602474064.

Adding to 121405207 its reverse (702504121), we get a palindrome (823909328).

The spelling of 121405207 in words is "one hundred twenty-one million, four hundred five thousand, two hundred seven".