121620407 has 4 divisors (see below), whose sum is σ = 122578176. Its totient is φ = 120662640.

The previous prime is 121620379. The next prime is 121620419. The reversal of 121620407 is 704026121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704026121 = 37 ⋅19027733.

It is a cyclic number.

It is not a de Polignac number, because 121620407 - 2⁸ = 121620151 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 (121620467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478694 + ... + 478947.

It is an arithmetic number, because the mean of its divisors is an integer number (30644544).

Almost surely, 2^121620407 is an apocalyptic number.

121620407 is a deficient number, since it is larger than the sum of its proper divisors (957769).

121620407 is an equidigital number, since it uses as much as digits as its factorization.

121620407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957768.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 121620407 is about 11028.1642624691. The cubic root of 121620407 is about 495.4526444921.

Adding to 121620407 its reverse (704026121), we get a palindrome (825646528).

The spelling of 121620407 in words is "one hundred twenty-one million, six hundred twenty thousand, four hundred seven".