121211320 has 16 divisors (see below), whose sum is σ = 272725560. Its totient is φ = 48484512.

The previous prime is 121211273. The next prime is 121211323. The reversal of 121211320 is 23112121.

It is a super-2 number, since 2×121211320² = 29384368192284800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121211320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515102 + ... + 1515181.

Almost surely, 2^121211320 is an apocalyptic number.

121211320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121211320 is an abundant number, since it is smaller than the sum of its proper divisors (151514240).

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

121211320 is a wasteful number, since it uses less digits than its factorization.

121211320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030294 (or 3030290 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 121211320 is about 11009.6012643510. The cubic root of 121211320 is about 494.8965127332.

Adding to 121211320 its reverse (23112121), we get a palindrome (144323441).

The spelling of 121211320 in words is "one hundred twenty-one million, two hundred eleven thousand, three hundred twenty".