121347281 has 16 divisors (see below), whose sum is σ = 144158400. Its totient is φ = 100900800.

The previous prime is 121347277. The next prime is 121347301. The reversal of 121347281 is 182743121.

It is not a de Polignac number, because 121347281 - 2² = 121347277 is a prime.

It is a super-3 number, since 3×121347281³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121347211) 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, 3950 + ... + 16071.

It is an arithmetic number, because the mean of its divisors is an integer number (9009900).

Almost surely, 2^121347281 is an apocalyptic number.

121347281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121347281 is a deficient number, since it is larger than the sum of its proper divisors (22811119).

121347281 is a wasteful number, since it uses less digits than its factorization.

121347281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20080.

The product of its digits is 2688, while the sum is 29.

The square root of 121347281 is about 11015.7741897699. The cubic root of 121347281 is about 495.0814830321.

The spelling of 121347281 in words is "one hundred twenty-one million, three hundred forty-seven thousand, two hundred eighty-one".