21312033233311 has 2 divisors, whose sum is σ = 21312033233312. Its totient is φ = 21312033233310.

The previous prime is 21312033233287. The next prime is 21312033233347. The reversal of 21312033233311 is 11333233021312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21312033233311 - 2¹¹ = 21312033231263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21312033233311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21312033033311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656016616655 + 10656016616656.

It is an arithmetic number, because the mean of its divisors is an integer number (10656016616656).

Almost surely, 2^{21312033233311} is an apocalyptic number.

21312033233311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312033233311 is an equidigital number, since it uses as much as digits as its factorization.

21312033233311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 21312033233311 its reverse (11333233021312), we get a palindrome (32645266254623).

The spelling of 21312033233311 in words is "twenty-one trillion, three hundred twelve billion, thirty-three million, two hundred thirty-three thousand, three hundred eleven".