121800013 has 16 divisors (see below), whose sum is σ = 131328000. Its totient is φ = 112614192.

The previous prime is 121799999. The next prime is 121800017. The reversal of 121800013 is 310008121.

It is a cyclic number.

It is not a de Polignac number, because 121800013 - 2¹³ = 121791821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121800013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121800017) 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, 200356 + ... + 200962.

It is an arithmetic number, because the mean of its divisors is an integer number (8208000).

Almost surely, 2^121800013 is an apocalyptic number.

It is an amenable number.

121800013 is a deficient number, since it is larger than the sum of its proper divisors (9527987).

121800013 is a wasteful number, since it uses less digits than its factorization.

121800013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 121800013 is about 11036.3043180224. The cubic root of 121800013 is about 495.6964152581.

Adding to 121800013 its reverse (310008121), we get a palindrome (431808134).

The spelling of 121800013 in words is "one hundred twenty-one million, eight hundred thousand, thirteen".