130021421 has 2 divisors, whose sum is σ = 130021422. Its totient is φ = 130021420.

The previous prime is 130021399. The next prime is 130021429. The reversal of 130021421 is 124120031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122655625 + 7365796 = 11075^2 + 2714^2 .

It is a cyclic number.

It is not a de Polignac number, because 130021421 - 2²⁶ = 62912557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 130021396 and 130021405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130021429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65010710 + 65010711.

It is an arithmetic number, because the mean of its divisors is an integer number (65010711).

Almost surely, 2^130021421 is an apocalyptic number.

It is an amenable number.

130021421 is a deficient number, since it is larger than the sum of its proper divisors (1).

130021421 is an equidigital number, since it uses as much as digits as its factorization.

130021421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 130021421 is about 11402.6935852894. The cubic root of 130021421 is about 506.6075245968.

Adding to 130021421 its reverse (124120031), we get a palindrome (254141452).

The spelling of 130021421 in words is "one hundred thirty million, twenty-one thousand, four hundred twenty-one".