121672013 has 4 divisors (see below), whose sum is σ = 122788380. Its totient is φ = 120555648.

The previous prime is 121671997. The next prime is 121672027. The reversal of 121672013 is 310276121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310276121 = 3457 ⋅89753.

It can be written as a sum of positive squares in 2 ways, for example, as 81956809 + 39715204 = 9053^2 + 6302^2 .

It is a cyclic number.

It is not a de Polignac number, because 121672013 - 2⁴ = 121671997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121672013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121672513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558020 + ... + 558237.

It is an arithmetic number, because the mean of its divisors is an integer number (30697095).

Almost surely, 2^121672013 is an apocalyptic number.

It is an amenable number.

121672013 is a deficient number, since it is larger than the sum of its proper divisors (1116367).

121672013 is a wasteful number, since it uses less digits than its factorization.

121672013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116366.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 121672013 is about 11030.5037509626. The cubic root of 121672013 is about 495.5227114440.

The spelling of 121672013 in words is "one hundred twenty-one million, six hundred seventy-two thousand, thirteen".