121213320 has 64 divisors (see below), whose sum is σ = 365929920. Its totient is φ = 32120064.

The previous prime is 121213307. The next prime is 121213321. The reversal of 121213320 is 23312121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121213320.

It is not an unprimeable number, because it can be changed into a prime (121213321) 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, 16462 + ... + 22658.

It is an arithmetic number, because the mean of its divisors is an integer number (5717655).

Almost surely, 2^121213320 is an apocalyptic number.

121213320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121213320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182964960).

121213320 is an abundant number, since it is smaller than the sum of its proper divisors (244716600).

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

121213320 is a wasteful number, since it uses less digits than its factorization.

121213320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6374 (or 6370 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 121213320 is about 11009.6920937872. The cubic root of 121213320 is about 494.8992346670.

Adding to 121213320 its reverse (23312121), we get a palindrome (144525441).

The spelling of 121213320 in words is "one hundred twenty-one million, two hundred thirteen thousand, three hundred twenty".