21121543330 has 16 divisors (see below), whose sum is σ = 38539584504. Its totient is φ = 8332882560.

The previous prime is 21121543321. The next prime is 21121543337. The reversal of 21121543330 is 3334512112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20932013041 + 189530289 = 144679^2 + 13767^2 .

It is a super-2 number, since 2×21121543330² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121543295 and 21121543304.

It is not an unprimeable number, because it can be changed into a prime (21121543337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14466081 + ... + 14467540.

Almost surely, 2^21121543330 is an apocalyptic number.

21121543330 is a deficient number, since it is larger than the sum of its proper divisors (17418041174).

21121543330 is a wasteful number, since it uses less digits than its factorization.

21121543330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28933701.

The product of its (nonzero) digits is 2160, while the sum is 25.

The spelling of 21121543330 in words is "twenty-one billion, one hundred twenty-one million, five hundred forty-three thousand, three hundred thirty".