21347929763191 has 2 divisors, whose sum is σ = 21347929763192. Its totient is φ = 21347929763190.

The previous prime is 21347929763143. The next prime is 21347929763227. The reversal of 21347929763191 is 19136792974312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21347929763191 - 2¹⁹ = 21347929238903 is a prime.

It is a super-2 number, since 2×21347929763191² (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 (21347629763191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10673964881595 + 10673964881596.

It is an arithmetic number, because the mean of its divisors is an integer number (10673964881596).

Almost surely, 2^{21347929763191} is an apocalyptic number.

21347929763191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21347929763191 is an equidigital number, since it uses as much as digits as its factorization.

21347929763191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30862944, while the sum is 64.

The spelling of 21347929763191 in words is "twenty-one trillion, three hundred forty-seven billion, nine hundred twenty-nine million, seven hundred sixty-three thousand, one hundred ninety-one".