21177462347 has 2 divisors, whose sum is σ = 21177462348. Its totient is φ = 21177462346.

The previous prime is 21177462269. The next prime is 21177462349. The reversal of 21177462347 is 74326477112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21177462347 - 2⁸ = 21177462091 is a prime.

It is a super-2 number, since 2×21177462347² (a number of 21 digits) contains 22 as substring.

Together with 21177462349, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21177462298 and 21177462307.

It is not a weakly prime, because it can be changed into another prime (21177462349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10588731173 + 10588731174.

It is an arithmetic number, because the mean of its divisors is an integer number (10588731174).

Almost surely, 2^21177462347 is an apocalyptic number.

21177462347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21177462347 is an equidigital number, since it uses as much as digits as its factorization.

21177462347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 44.

The spelling of 21177462347 in words is "twenty-one billion, one hundred seventy-seven million, four hundred sixty-two thousand, three hundred forty-seven".