21021212311306 has 8 divisors (see below), whose sum is σ = 31649037123780. Its totient is φ = 10471533270048.

The previous prime is 21021212311219. The next prime is 21021212311331. The reversal of 21021212311306 is 60311321212012.

It can be written as a sum of positive squares in 2 ways, for example, as 20944269873081 + 76942438225 = 4576491^2 + 277385^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 19536442131 + ... + 19536443206.

Almost surely, 2^{21021212311306} is an apocalyptic number.

21021212311306 is a deficient number, since it is larger than the sum of its proper divisors (10627824812474).

21021212311306 is a wasteful number, since it uses less digits than its factorization.

21021212311306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39072885608.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 21021212311306 its reverse (60311321212012), we get a palindrome (81332533523318).

The spelling of 21021212311306 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, three hundred eleven thousand, three hundred six".