21021212311307 has 8 divisors (see below), whose sum is σ = 22638455616000. Its totient is φ = 19404001431360.

The previous prime is 21021212311219. The next prime is 21021212311331. The reversal of 21021212311307 is 70311321212012.

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

It is not a de Polignac number, because 21021212311307 - 2¹⁸ = 21021212049163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021212311507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6751307 + ... + 9360692.

It is an arithmetic number, because the mean of its divisors is an integer number (2829806952000).

Almost surely, 2^{21021212311307} is an apocalyptic number.

21021212311307 is a deficient number, since it is larger than the sum of its proper divisors (1617243304693).

21021212311307 is a wasteful number, since it uses less digits than its factorization.

21021212311307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16212373.

The product of its (nonzero) digits is 1008, while the sum is 26.

Adding to 21021212311307 its reverse (70311321212012), we get a palindrome (91332533523319).

The spelling of 21021212311307 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, three hundred eleven thousand, three hundred seven".