21000212311 has 8 divisors (see below), whose sum is σ = 22656965744. Its totient is φ = 19349366400.

The previous prime is 21000212309. The next prime is 21000212339. The reversal of 21000212311 is 11321200012.

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

It is not a de Polignac number, because 21000212311 - 2¹ = 21000212309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is the 144915-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000212291 and 21000212300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000212351) by changing a digit.

It is a nontrivial repunit in base 144914.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1469490 + ... + 1483711.

It is an arithmetic number, because the mean of its divisors is an integer number (2832120718).

Almost surely, 2^21000212311 is an apocalyptic number.

21000212311 is a deficient number, since it is larger than the sum of its proper divisors (1656753433).

21000212311 is a wasteful number, since it uses less digits than its factorization.

21000212311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953761.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21000212311 its reverse (11321200012), we get a palindrome (32321412323).

The spelling of 21000212311 in words is "twenty-one billion, two hundred twelve thousand, three hundred eleven".