121706621 has 4 divisors (see below), whose sum is σ = 128865852. Its totient is φ = 114547392.

The previous prime is 121706597. The next prime is 121706623. The reversal of 121706621 is 126607121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 106605625 + 15100996 = 10325^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 121706621 - 2²⁶ = 54597757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121706623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3579590 + ... + 3579623.

It is an arithmetic number, because the mean of its divisors is an integer number (32216463).

Almost surely, 2^121706621 is an apocalyptic number.

It is an amenable number.

121706621 is a deficient number, since it is larger than the sum of its proper divisors (7159231).

121706621 is an equidigital number, since it uses as much as digits as its factorization.

121706621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7159230.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 121706621 is about 11032.0723801106. The cubic root of 121706621 is about 495.5696886244.

The spelling of 121706621 in words is "one hundred twenty-one million, seven hundred six thousand, six hundred twenty-one".