130721420 has 96 divisors (see below), whose sum is σ = 301916160. Its totient is φ = 47393280.

The previous prime is 130721399. The next prime is 130721447. The reversal of 130721420 is 24127031.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 130721392 and 130721401.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1269089 + ... + 1269191.

It is an arithmetic number, because the mean of its divisors is an integer number (3144960).

Almost surely, 2^130721420 is an apocalyptic number.

130721420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 130721420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150958080).

130721420 is an abundant number, since it is smaller than the sum of its proper divisors (171194740).

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

130721420 is a wasteful number, since it uses less digits than its factorization.

130721420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 130721420 is about 11433.3468415858. The cubic root of 130721420 is about 507.5150423846.

Adding to 130721420 its reverse (24127031), we get a palindrome (154848451).

The spelling of 130721420 in words is "one hundred thirty million, seven hundred twenty-one thousand, four hundred twenty".