130442240021 has 4 divisors (see below), whose sum is σ = 130506913452. Its totient is φ = 130377566592.

The previous prime is 130442239973. The next prime is 130442240053. The reversal of 130442240021 is 120042244031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120042244031 = 229 ⋅524201939.

It can be written as a sum of positive squares in 2 ways, for example, as 99090225796 + 31352014225 = 314786^2 + 177065^2 .

It is a cyclic number.

It is not a de Polignac number, because 130442240021 - 2¹⁸ = 130441977877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130442240821) 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, 32333690 + ... + 32337723.

It is an arithmetic number, because the mean of its divisors is an integer number (32626728363).

Almost surely, 2^130442240021 is an apocalyptic number.

It is an amenable number.

130442240021 is a deficient number, since it is larger than the sum of its proper divisors (64673431).

130442240021 is an equidigital number, since it uses as much as digits as its factorization.

130442240021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64673430.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 130442240021 its reverse (120042244031), we get a palindrome (250484484052).

The spelling of 130442240021 in words is "one hundred thirty billion, four hundred forty-two million, two hundred forty thousand, twenty-one".