21771107333 has 2 divisors, whose sum is σ = 21771107334. Its totient is φ = 21771107332.

The previous prime is 21771107249. The next prime is 21771107353. The reversal of 21771107333 is 33370117712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14258031649 + 7513075684 = 119407^2 + 86678^2 .

It is a cyclic number.

It is not a de Polignac number, because 21771107333 - 2¹⁶ = 21771041797 is a prime.

It is a super-2 number, since 2×21771107333² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21771107293 and 21771107302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21771107353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10885553666 + 10885553667.

It is an arithmetic number, because the mean of its divisors is an integer number (10885553667).

Almost surely, 2^21771107333 is an apocalyptic number.

It is an amenable number.

21771107333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21771107333 is an equidigital number, since it uses as much as digits as its factorization.

21771107333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18522, while the sum is 35.

The spelling of 21771107333 in words is "twenty-one billion, seven hundred seventy-one million, one hundred seven thousand, three hundred thirty-three".