121221366 has 32 divisors (see below), whose sum is σ = 282977280. Its totient is φ = 33897216.

The previous prime is 121221337. The next prime is 121221371. The reversal of 121221366 is 663122121.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28731 + ... + 32678.

It is an arithmetic number, because the mean of its divisors is an integer number (8843040).

Almost surely, 2^121221366 is an apocalyptic number.

121221366 is an abundant number, since it is smaller than the sum of its proper divisors (161755914).

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

121221366 is a wasteful number, since it uses less digits than its factorization.

121221366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61468.

The product of its digits is 864, while the sum is 24.

The square root of 121221366 is about 11010.0574930379. The cubic root of 121221366 is about 494.9101847043.

Adding to 121221366 its reverse (663122121), we get a palindrome (784343487).

It can be divided in two parts, 1212 and 21366, that added together give a triangular number (22578 = T₂₁₂).

The spelling of 121221366 in words is "one hundred twenty-one million, two hundred twenty-one thousand, three hundred sixty-six".