1530721235023 has 4 divisors (see below), whose sum is σ = 1530998595360. Its totient is φ = 1530443874688.

The previous prime is 1530721235011. The next prime is 1530721235039. The reversal of 1530721235023 is 3205321270351.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1530721235023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1530721235023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1530721235053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138671890 + ... + 138682927.

It is an arithmetic number, because the mean of its divisors is an integer number (382749648840).

Almost surely, 2^{1530721235023} is an apocalyptic number.

1530721235023 is a deficient number, since it is larger than the sum of its proper divisors (277360337).

1530721235023 is an equidigital number, since it uses as much as digits as its factorization.

1530721235023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277360336.

The product of its (nonzero) digits is 37800, while the sum is 34.

The spelling of 1530721235023 in words is "one trillion, five hundred thirty billion, seven hundred twenty-one million, two hundred thirty-five thousand, twenty-three".