21043532212 has 12 divisors (see below), whose sum is σ = 38992427460. Its totient is φ = 9902838656.

The previous prime is 21043532179. The next prime is 21043532227. The reversal of 21043532212 is 21223534012.

It can be written as a sum of positive squares in 2 ways, for example, as 8707875856 + 12335656356 = 93316^2 + 111066^2 .

It is a super-2 number, since 2×21043532212² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 154731787 + ... + 154731922.

It is an arithmetic number, because the mean of its divisors is an integer number (3249368955).

Almost surely, 2^21043532212 is an apocalyptic number.

It is an amenable number.

21043532212 is a deficient number, since it is larger than the sum of its proper divisors (17948895248).

21043532212 is a wasteful number, since it uses less digits than its factorization.

21043532212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309463730 (or 309463728 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The spelling of 21043532212 in words is "twenty-one billion, forty-three million, five hundred thirty-two thousand, two hundred twelve".