21133212277 has 2 divisors, whose sum is σ = 21133212278. Its totient is φ = 21133212276.

The previous prime is 21133212271. The next prime is 21133212313. The reversal of 21133212277 is 77221233112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15596512996 + 5536699281 = 124886^2 + 74409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21133212277 is a prime.

It is a super-2 number, since 2×21133212277² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21133212271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566606138 + 10566606139.

It is an arithmetic number, because the mean of its divisors is an integer number (10566606139).

Almost surely, 2^21133212277 is an apocalyptic number.

It is an amenable number.

21133212277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133212277 is an equidigital number, since it uses as much as digits as its factorization.

21133212277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 31.

Adding to 21133212277 its reverse (77221233112), we get a palindrome (98354445389).

The spelling of 21133212277 in words is "twenty-one billion, one hundred thirty-three million, two hundred twelve thousand, two hundred seventy-seven".