247390244921 has 2 divisors, whose sum is σ = 247390244922. Its totient is φ = 247390244920.

The previous prime is 247390244861. The next prime is 247390244923. The reversal of 247390244921 is 129442093742.

247390244921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246600634921 + 789610000 = 496589^2 + 28100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247390244921 is a prime.

It is a super-2 number, since 2×247390244921² (a number of 24 digits) contains 22 as substring.

Together with 247390244923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (247390244923) 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, 123695122460 + 123695122461.

It is an arithmetic number, because the mean of its divisors is an integer number (123695122461).

Almost surely, 2^247390244921 is an apocalyptic number.

It is an amenable number.

247390244921 is a deficient number, since it is larger than the sum of its proper divisors (1).

247390244921 is an equidigital number, since it uses as much as digits as its factorization.

247390244921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 247390244921 in words is "two hundred forty-seven billion, three hundred ninety million, two hundred forty-four thousand, nine hundred twenty-one".