121211607 has 16 divisors (see below), whose sum is σ = 176879232. Its totient is φ = 73223520.

The previous prime is 121211603. The next prime is 121211617. The reversal of 121211607 is 706112121.

It is a happy number.

It is not a de Polignac number, because 121211607 - 2² = 121211603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4668 + ... + 16254.

It is an arithmetic number, because the mean of its divisors is an integer number (11054952).

Almost surely, 2^121211607 is an apocalyptic number.

121211607 is a deficient number, since it is larger than the sum of its proper divisors (55667625).

121211607 is a wasteful number, since it uses less digits than its factorization.

121211607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11918.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 121211607 is about 11009.6142984212. The cubic root of 121211607 is about 494.8969033325.

Adding to 121211607 its reverse (706112121), we get a palindrome (827323728).

The spelling of 121211607 in words is "one hundred twenty-one million, two hundred eleven thousand, six hundred seven".