21450000001 has 2 divisors, whose sum is σ = 21450000002. Its totient is φ = 21450000000.

The previous prime is 21449999941. The next prime is 21450000023. The reversal of 21450000001 is 10000005412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14538571776 + 6911428225 = 120576^2 + 83135^2 .

It is a cyclic number.

It is not a de Polignac number, because 21450000001 - 2⁷ = 21449999873 is a prime.

It is not a weakly prime, because it can be changed into another prime (21450000101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725000000 + 10725000001.

It is an arithmetic number, because the mean of its divisors is an integer number (10725000001).

Almost surely, 2^21450000001 is an apocalyptic number.

It is an amenable number.

21450000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450000001 is an equidigital number, since it uses as much as digits as its factorization.

21450000001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 13.

Adding to 21450000001 its reverse (10000005412), we get a palindrome (31450005413).

The spelling of 21450000001 in words is "twenty-one billion, four hundred fifty million, one", and thus it is an aban number.