21240343332 has 72 divisors (see below), whose sum is σ = 57849073464. Its totient is φ = 6532310016.

The previous prime is 21240343331. The next prime is 21240343349. The reversal of 21240343332 is 23334304212.

21240343332 is a `hidden beast` number, since 212 + 403 + 43 + 3 + 3 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1323795456 + 19916547876 = 36384^2 + 141126^2 .

It is a super-2 number, since 2×21240343332² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21240343296 and 21240343305.

It is not an unprimeable number, because it can be changed into a prime (21240343331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1063228 + ... + 1083020.

Almost surely, 2^21240343332 is an apocalyptic number.

It is an amenable number.

21240343332 is an abundant number, since it is smaller than the sum of its proper divisors (36608730132).

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

21240343332 is a wasteful number, since it uses less digits than its factorization.

21240343332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22109 (or 22104 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21240343332 its reverse (23334304212), we get a palindrome (44574647544).

The spelling of 21240343332 in words is "twenty-one billion, two hundred forty million, three hundred forty-three thousand, three hundred thirty-two".