21320113323109 has 2 divisors, whose sum is σ = 21320113323110. Its totient is φ = 21320113323108.

The previous prime is 21320113322957. The next prime is 21320113323233. The reversal of 21320113323109 is 90132331102312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15164365281025 + 6155748042084 = 3894145^2 + 2481078^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320113323109 - 2³³ = 21311523388517 is a prime.

It is a super-2 number, since 2×21320113323109² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320113393109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660056661554 + 10660056661555.

It is an arithmetic number, because the mean of its divisors is an integer number (10660056661555).

Almost surely, 2^{21320113323109} is an apocalyptic number.

It is an amenable number.

21320113323109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320113323109 is an equidigital number, since it uses as much as digits as its factorization.

21320113323109 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 31.

The spelling of 21320113323109 in words is "twenty-one trillion, three hundred twenty billion, one hundred thirteen million, three hundred twenty-three thousand, one hundred nine".