2121321330 has 24 divisors (see below), whose sum is σ = 5515435692. Its totient is φ = 565685664.

The previous prime is 2121321317. The next prime is 2121321347. The reversal of 2121321330 is 331231212.

2121321330 is a `hidden beast` number, since 2 + 12 + 1 + 321 + 330 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2044215369 + 77105961 = 45213^2 + 8781^2 .

It is a super-2 number, since 2×2121321330² = 9000008370225937800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11785029 + ... + 11785208.

Almost surely, 2^2121321330 is an apocalyptic number.

2121321330 is an abundant number, since it is smaller than the sum of its proper divisors (3394114362).

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

2121321330 is a wasteful number, since it uses less digits than its factorization.

2121321330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23570250 (or 23570247 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 2121321330 is about 46057.8042246914. The cubic root of 2121321330 is about 1284.8984925899.

Adding to 2121321330 its reverse (331231212), we get a palindrome (2452552542).

The spelling of 2121321330 in words is "two billion, one hundred twenty-one million, three hundred twenty-one thousand, three hundred thirty".