21751109392319 has 2 divisors, whose sum is σ = 21751109392320. Its totient is φ = 21751109392318.

The previous prime is 21751109392283. The next prime is 21751109392357. The reversal of 21751109392319 is 91329390115712.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21751109392319 is a prime.

It is a super-2 number, since 2×21751109392319² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21751109392379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10875554696159 + 10875554696160.

It is an arithmetic number, because the mean of its divisors is an integer number (10875554696160).

Almost surely, 2^{21751109392319} is an apocalyptic number.

21751109392319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21751109392319 is an equidigital number, since it uses as much as digits as its factorization.

21751109392319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 918540, while the sum is 53.

The spelling of 21751109392319 in words is "twenty-one trillion, seven hundred fifty-one billion, one hundred nine million, three hundred ninety-two thousand, three hundred nineteen".