21345506012 has 6 divisors (see below), whose sum is σ = 37354635528. Its totient is φ = 10672753004.

The previous prime is 21345505991. The next prime is 21345506029. The reversal of 21345506012 is 21060554312.

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 as a sum of consecutive naturals, namely, 2668188248 + ... + 2668188255.

It is an arithmetic number, because the mean of its divisors is an integer number (6225772588).

Almost surely, 2^21345506012 is an apocalyptic number.

It is an amenable number.

21345506012 is a deficient number, since it is larger than the sum of its proper divisors (16009129516).

21345506012 is a wasteful number, since it uses less digits than its factorization.

21345506012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5336376507 (or 5336376505 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 21345506012 in words is "twenty-one billion, three hundred forty-five million, five hundred six thousand, twelve".