30921653439797 has 2 divisors, whose sum is σ = 30921653439798. Its totient is φ = 30921653439796.

The previous prime is 30921653439791. The next prime is 30921653439821. The reversal of 30921653439797 is 79793435612903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23632296025636 + 7289357414161 = 4861306^2 + 2699881^2 .

It is an emirp because it is prime and its reverse (79793435612903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30921653439797 - 2²⁶ = 30921586330933 is a prime.

It is a super-2 number, since 2×30921653439797² (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 (30921653439791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15460826719898 + 15460826719899.

It is an arithmetic number, because the mean of its divisors is an integer number (15460826719899).

Almost surely, 2^{30921653439797} is an apocalyptic number.

It is an amenable number.

30921653439797 is a deficient number, since it is larger than the sum of its proper divisors (1).

30921653439797 is an equidigital number, since it uses as much as digits as its factorization.

30921653439797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 231472080, while the sum is 68.

The spelling of 30921653439797 in words is "thirty trillion, nine hundred twenty-one billion, six hundred fifty-three million, four hundred thirty-nine thousand, seven hundred ninety-seven".