21112768933 has 2 divisors, whose sum is σ = 21112768934. Its totient is φ = 21112768932.

The previous prime is 21112768927. The next prime is 21112769003. The reversal of 21112768933 is 33986721112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20561552449 + 551216484 = 143393^2 + 23478^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112768933 - 2¹³ = 21112760741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21112768933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112762933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556384466 + 10556384467.

It is an arithmetic number, because the mean of its divisors is an integer number (10556384467).

Almost surely, 2^21112768933 is an apocalyptic number.

It is an amenable number.

21112768933 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112768933 is an equidigital number, since it uses as much as digits as its factorization.

21112768933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The spelling of 21112768933 in words is "twenty-one billion, one hundred twelve million, seven hundred sixty-eight thousand, nine hundred thirty-three".