21043401229 has 2 divisors, whose sum is σ = 21043401230. Its totient is φ = 21043401228.

The previous prime is 21043401221. The next prime is 21043401277. The reversal of 21043401229 is 92210434012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20195252100 + 848149129 = 142110^2 + 29123^2 .

It is a cyclic number.

It is not a de Polignac number, because 21043401229 - 2³ = 21043401221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21043401197 and 21043401206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21043401221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521700614 + 10521700615.

It is an arithmetic number, because the mean of its divisors is an integer number (10521700615).

Almost surely, 2^21043401229 is an apocalyptic number.

It is an amenable number.

21043401229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043401229 is an equidigital number, since it uses as much as digits as its factorization.

21043401229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 21043401229 in words is "twenty-one billion, forty-three million, four hundred one thousand, two hundred twenty-nine".