30938369821 has 2 divisors, whose sum is σ = 30938369822. Its totient is φ = 30938369820.

The previous prime is 30938369783. The next prime is 30938369849. The reversal of 30938369821 is 12896383903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25781119225 + 5157250596 = 160565^2 + 71814^2 .

It is a cyclic number.

It is not a de Polignac number, because 30938369821 - 2²³ = 30929981213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30938369881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15469184910 + 15469184911.

It is an arithmetic number, because the mean of its divisors is an integer number (15469184911).

Almost surely, 2^30938369821 is an apocalyptic number.

It is an amenable number.

30938369821 is a deficient number, since it is larger than the sum of its proper divisors (1).

30938369821 is an equidigital number, since it uses as much as digits as its factorization.

30938369821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 30938369821 in words is "thirty billion, nine hundred thirty-eight million, three hundred sixty-nine thousand, eight hundred twenty-one".