130021021 has 4 divisors (see below), whose sum is σ = 140022652. Its totient is φ = 120019392.

The previous prime is 130020983. The next prime is 130021033. The reversal of 130021021 is 120120031.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39200121 + 90820900 = 6261^2 + 9530^2 .

It is a cyclic number.

It is not a de Polignac number, because 130021021 - 2⁹ = 130020509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 130020989 and 130021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130021051) 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, 5000796 + ... + 5000821.

It is an arithmetic number, because the mean of its divisors is an integer number (35005663).

Almost surely, 2^130021021 is an apocalyptic number.

It is an amenable number.

130021021 is a deficient number, since it is larger than the sum of its proper divisors (10001631).

130021021 is a wasteful number, since it uses less digits than its factorization.

130021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10001630.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 130021021 is about 11402.6760455605. The cubic root of 130021021 is about 506.6070050844.

Adding to 130021021 its reverse (120120031), we get a palindrome (250141052).

The spelling of 130021021 in words is "one hundred thirty million, twenty-one thousand, twenty-one".