121381807 has 4 divisors (see below), whose sum is σ = 122196600. Its totient is φ = 120567016.

The previous prime is 121381789. The next prime is 121381811. The reversal of 121381807 is 708183121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 708183121 = 14699 ⋅48179.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121381807 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 (121381847) 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, 407173 + ... + 407470.

It is an arithmetic number, because the mean of its divisors is an integer number (30549150).

Almost surely, 2^121381807 is an apocalyptic number.

121381807 is a deficient number, since it is larger than the sum of its proper divisors (814793).

121381807 is an equidigital number, since it uses as much as digits as its factorization.

121381807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814792.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 121381807 is about 11017.3411946803. The cubic root of 121381807 is about 495.1284324769.

The spelling of 121381807 in words is "one hundred twenty-one million, three hundred eighty-one thousand, eight hundred seven".