921957247819 has 2 divisors, whose sum is σ = 921957247820. Its totient is φ = 921957247818.

The previous prime is 921957247817. The next prime is 921957247831. The reversal of 921957247819 is 918742759129.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 921957247819 - 2¹ = 921957247817 is a prime.

It is a super-2 number, since 2×921957247819² (a number of 25 digits) contains 22 as substring.

Together with 921957247817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (921957247817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460978623909 + 460978623910.

It is an arithmetic number, because the mean of its divisors is an integer number (460978623910).

Almost surely, 2^921957247819 is an apocalyptic number.

921957247819 is a deficient number, since it is larger than the sum of its proper divisors (1).

921957247819 is an equidigital number, since it uses as much as digits as its factorization.

921957247819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 64.

The spelling of 921957247819 in words is "nine hundred twenty-one billion, nine hundred fifty-seven million, two hundred forty-seven thousand, eight hundred nineteen".