130721442 has 8 divisors (see below), whose sum is σ = 261442896. Its totient is φ = 43573812.

The previous prime is 130721399. The next prime is 130721447. The reversal of 130721442 is 244127031.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

130721442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (130721447) 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, 10893448 + ... + 10893459.

It is an arithmetic number, because the mean of its divisors is an integer number (32680362).

Almost surely, 2^130721442 is an apocalyptic number.

130721442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

130721442 is a wasteful number, since it uses less digits than its factorization.

130721442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21786912.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 130721442 is about 11433.3478036837. The cubic root of 130721442 is about 507.5150708556.

Adding to 130721442 its reverse (244127031), we get a palindrome (374848473).

The spelling of 130721442 in words is "one hundred thirty million, seven hundred twenty-one thousand, four hundred forty-two".