30921653439791 has 2 divisors, whose sum is σ = 30921653439792. Its totient is φ = 30921653439790.

The previous prime is 30921653439763. The next prime is 30921653439797. The reversal of 30921653439791 is 19793435612903.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30921653439791 - 2⁶ = 30921653439727 is a prime.

It is a super-2 number, since 2×30921653439791² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30921653439797) 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, 15460826719895 + 15460826719896.

It is an arithmetic number, because the mean of its divisors is an integer number (15460826719896).

Almost surely, 2^{30921653439791} is an apocalyptic number.

30921653439791 is a deficient number, since it is larger than the sum of its proper divisors (1).

30921653439791 is an equidigital number, since it uses as much as digits as its factorization.

30921653439791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33067440, while the sum is 62.

The spelling of 30921653439791 in words is "thirty trillion, nine hundred twenty-one billion, six hundred fifty-three million, four hundred thirty-nine thousand, seven hundred ninety-one".