2121211320 has 64 divisors (see below), whose sum is σ = 6366708000. Its totient is φ = 565383168.

The previous prime is 2121211289. The next prime is 2121211327. The reversal of 2121211320 is 231121212.

It is a super-2 number, since 2×2121211320² = 8999074928192284800, which contains 22 as substring.

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 2121211320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121211327) 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, 420976 + ... + 425984.

Almost surely, 2^2121211320 is an apocalyptic number.

2121211320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121211320 is an abundant number, since it is smaller than the sum of its proper divisors (4245496680).

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

2121211320 is a wasteful number, since it uses less digits than its factorization.

2121211320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8552 (or 8548 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2121211320 is about 46056.6099490616. The cubic root of 2121211320 is about 1284.8762809421.

Adding to 2121211320 its reverse (231121212), we get a palindrome (2352332532).

The spelling of 2121211320 in words is "two billion, one hundred twenty-one million, two hundred eleven thousand, three hundred twenty".