30021438749 has 2 divisors, whose sum is σ = 30021438750. Its totient is φ = 30021438748.

The previous prime is 30021438697. The next prime is 30021438767. The reversal of 30021438749 is 94783412003.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25458436249 + 4563002500 = 159557^2 + 67550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30021438749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30021438449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15010719374 + 15010719375.

It is an arithmetic number, because the mean of its divisors is an integer number (15010719375).

Almost surely, 2^30021438749 is an apocalyptic number.

It is an amenable number.

30021438749 is a deficient number, since it is larger than the sum of its proper divisors (1).

30021438749 is an equidigital number, since it uses as much as digits as its factorization.

30021438749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 30021438749 in words is "thirty billion, twenty-one million, four hundred thirty-eight thousand, seven hundred forty-nine".