120421000009 has 2 divisors, whose sum is σ = 120421000010. Its totient is φ = 120421000008.

The previous prime is 120420999901. The next prime is 120421000061. The reversal of 120421000009 is 900000124021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78878407609 + 41542592400 = 280853^2 + 203820^2 .

It is a cyclic number.

It is not a de Polignac number, because 120421000009 - 2¹⁷ = 120420868937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120421000009.

It is not a weakly prime, because it can be changed into another prime (120421000079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60210500004 + 60210500005.

It is an arithmetic number, because the mean of its divisors is an integer number (60210500005).

Almost surely, 2^120421000009 is an apocalyptic number.

It is an amenable number.

120421000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

120421000009 is an equidigital number, since it uses as much as digits as its factorization.

120421000009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 120421000009 in words is "one hundred twenty billion, four hundred twenty-one million, nine", and thus it is an aban number.