21111231000311 has 4 divisors (see below), whose sum is σ = 22222348421400. Its totient is φ = 20000113579224.

The previous prime is 21111231000287. The next prime is 21111231000337. The reversal of 21111231000311 is 11300013211112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111231000311 is a prime.

It is a super-3 number, since 3×21111231000311³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111231000311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111231000361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555558710516 + ... + 555558710553.

It is an arithmetic number, because the mean of its divisors is an integer number (5555587105350).

Almost surely, 2^{21111231000311} is an apocalyptic number.

21111231000311 is a deficient number, since it is larger than the sum of its proper divisors (1111117421089).

21111231000311 is a wasteful number, since it uses less digits than its factorization.

21111231000311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111117421088.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 21111231000311 its reverse (11300013211112), we get a palindrome (32411244211423).

The spelling of 21111231000311 in words is "twenty-one trillion, one hundred eleven billion, two hundred thirty-one million, three hundred eleven", and thus it is an aban number.