121215126 has 16 divisors (see below), whose sum is σ = 243290304. Its totient is φ = 40261704.

The previous prime is 121215119. The next prime is 121215131. The reversal of 121215126 is 621512121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33996 + ... + 37391.

It is an arithmetic number, because the mean of its divisors is an integer number (15205644).

Almost surely, 2^121215126 is an apocalyptic number.

121215126 is an abundant number, since it is smaller than the sum of its proper divisors (122075178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121215126 is a wasteful number, since it uses less digits than its factorization.

121215126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71675.

The product of its digits is 240, while the sum is 21.

The square root of 121215126 is about 11009.7741121242. The cubic root of 121215126 is about 494.9016925475.

Adding to 121215126 its reverse (621512121), we get a palindrome (742727247).

The spelling of 121215126 in words is "one hundred twenty-one million, two hundred fifteen thousand, one hundred twenty-six".