121281139 has 16 divisors (see below), whose sum is σ = 145981440. Its totient is φ = 98508960.

The previous prime is 121281133. The next prime is 121281151. The reversal of 121281139 is 931182121.

It is a cyclic number.

It is not a de Polignac number, because 121281139 - 2⁵ = 121281107 is a prime.

It is a super-2 number, since 2×121281139² = 29418229354274642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121281133) 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, 14094 + ... + 21004.

It is an arithmetic number, because the mean of its divisors is an integer number (9123840).

Almost surely, 2^121281139 is an apocalyptic number.

121281139 is a deficient number, since it is larger than the sum of its proper divisors (24700301).

121281139 is a wasteful number, since it uses less digits than its factorization.

121281139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7050.

The product of its digits is 864, while the sum is 28.

The square root of 121281139 is about 11012.7716311563. The cubic root of 121281139 is about 494.9915163665.

The spelling of 121281139 in words is "one hundred twenty-one million, two hundred eighty-one thousand, one hundred thirty-nine".