21511066331212 has 12 divisors (see below), whose sum is σ = 38067336485640. Its totient is φ = 10634684478176.

The previous prime is 21511066331189. The next prime is 21511066331219. The reversal of 21511066331212 is 21213366011512.

It is not an unprimeable number, because it can be changed into a prime (21511066331219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30212171458 + ... + 30212172169.

It is an arithmetic number, because the mean of its divisors is an integer number (3172278040470).

Almost surely, 2^{21511066331212} is an apocalyptic number.

It is an amenable number.

21511066331212 is a deficient number, since it is larger than the sum of its proper divisors (16556270154428).

21511066331212 is a wasteful number, since it uses less digits than its factorization.

21511066331212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60424343720 (or 60424343718 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 21511066331212 in words is "twenty-one trillion, five hundred eleven billion, sixty-six million, three hundred thirty-one thousand, two hundred twelve".