121367881 has 4 divisors (see below), whose sum is σ = 124648132. Its totient is φ = 118087632.

The previous prime is 121367837. The next prime is 121367893. The reversal of 121367881 is 188763121.

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 107744400 + 13623481 = 10380^2 + 3691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121367881 is a prime.

It is a super-2 number, since 2×121367881² = 29460325076860322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 3280213 = 121367881 / (1 + 2 + 1 + 3 + 6 + 7 + 8 + 8 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121367881.

It is not an unprimeable number, because it can be changed into a prime (121368881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640070 + ... + 1640143.

It is an arithmetic number, because the mean of its divisors is an integer number (31162033).

Almost surely, 2^121367881 is an apocalyptic number.

121367881 is the 6361-st hex number.

It is an amenable number.

121367881 is a deficient number, since it is larger than the sum of its proper divisors (3280251).

121367881 is an equidigital number, since it uses as much as digits as its factorization.

121367881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280250.

The product of its digits is 16128, while the sum is 37.

The square root of 121367881 is about 11016.7091728882. The cubic root of 121367881 is about 495.1094965742.

The spelling of 121367881 in words is "one hundred twenty-one million, three hundred sixty-seven thousand, eight hundred eighty-one".