121286138 has 4 divisors (see below), whose sum is σ = 181929210. Its totient is φ = 60643068.

The previous prime is 121286129. The next prime is 121286141. The reversal of 121286138 is 831682121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 112423609 + 8862529 = 10603^2 + 2977^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30321533 + ... + 30321536.

Almost surely, 2^121286138 is an apocalyptic number.

121286138 is a deficient number, since it is larger than the sum of its proper divisors (60643072).

121286138 is an equidigital number, since it uses as much as digits as its factorization.

121286138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60643071.

The product of its digits is 4608, while the sum is 32.

The square root of 121286138 is about 11012.9985925723. The cubic root of 121286138 is about 494.9983171728.

The spelling of 121286138 in words is "one hundred twenty-one million, two hundred eighty-six thousand, one hundred thirty-eight".