121281073 has 4 divisors (see below), whose sum is σ = 121341220. Its totient is φ = 121220928.

The previous prime is 121281053. The next prime is 121281089. The reversal of 121281073 is 370182121.

It is a happy number.

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 84217329 + 37063744 = 9177^2 + 6088^2 .

It is a cyclic number.

It is not a de Polignac number, because 121281073 - 2²¹ = 119183921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121281023) 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, 26940 + ... + 31117.

It is an arithmetic number, because the mean of its divisors is an integer number (30335305).

Almost surely, 2^121281073 is an apocalyptic number.

It is an amenable number.

121281073 is a deficient number, since it is larger than the sum of its proper divisors (60147).

121281073 is an equidigital number, since it uses as much as digits as its factorization.

121281073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60146.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 121281073 is about 11012.7686346350. The cubic root of 121281073 is about 494.9914265767.

The spelling of 121281073 in words is "one hundred twenty-one million, two hundred eighty-one thousand, seventy-three".