21011320327 has 2 divisors, whose sum is σ = 21011320328. Its totient is φ = 21011320326.

The previous prime is 21011320313. The next prime is 21011320333. The reversal of 21011320327 is 72302311012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011320327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011320298 and 21011320307.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011320427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505660163 + 10505660164.

It is an arithmetic number, because the mean of its divisors is an integer number (10505660164).

Almost surely, 2^21011320327 is an apocalyptic number.

21011320327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011320327 is an equidigital number, since it uses as much as digits as its factorization.

21011320327 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 21011320327 its reverse (72302311012), we get a palindrome (93313631339).

The spelling of 21011320327 in words is "twenty-one billion, eleven million, three hundred twenty thousand, three hundred twenty-seven".