21120213330 has 48 divisors (see below), whose sum is σ = 58142709144. Its totient is φ = 5300759040.

The previous prime is 21120213319. The next prime is 21120213341. The reversal of 21120213330 is 3331202112.

21120213330 is a `hidden beast` number, since 2 + 1 + 120 + 213 + 330 = 666.

It is an interprime number because it is at equal distance from previous prime (21120213319) and next prime (21120213341).

It can be written as a sum of positive squares in 4 ways, for example, as 14467037841 + 6653175489 = 120279^2 + 81567^2 .

It is a super-2 number, since 2×21120213330² (a number of 21 digits) 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 23 ways as a sum of consecutive naturals, for example, 6900501 + ... + 6903560.

Almost surely, 2^21120213330 is an apocalyptic number.

21120213330 is an abundant number, since it is smaller than the sum of its proper divisors (37022495814).

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

21120213330 is a wasteful number, since it uses less digits than its factorization.

21120213330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13804091 (or 13804088 counting only the distinct ones).

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

Adding to 21120213330 its reverse (3331202112), we get a palindrome (24451415442).

The spelling of 21120213330 in words is "twenty-one billion, one hundred twenty million, two hundred thirteen thousand, three hundred thirty".