21120301009 has 2 divisors, whose sum is σ = 21120301010. Its totient is φ = 21120301008.

The previous prime is 21120300983. The next prime is 21120301019. The reversal of 21120301009 is 90010302112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16039462609 + 5080838400 = 126647^2 + 71280^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120301009 - 2²⁹ = 20583430097 is a prime.

It is a super-2 number, since 2×21120301009² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21120301019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560150504 + 10560150505.

It is an arithmetic number, because the mean of its divisors is an integer number (10560150505).

Almost surely, 2^21120301009 is an apocalyptic number.

It is an amenable number.

21120301009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120301009 is an equidigital number, since it uses as much as digits as its factorization.

21120301009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The spelling of 21120301009 in words is "twenty-one billion, one hundred twenty million, three hundred one thousand, nine".