21211201829 has 2 divisors, whose sum is σ = 21211201830. Its totient is φ = 21211201828.

The previous prime is 21211201813. The next prime is 21211201859. The reversal of 21211201829 is 92810211212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13271500804 + 7939701025 = 115202^2 + 89105^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211201829 - 2⁴ = 21211201813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211201859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605600914 + 10605600915.

It is an arithmetic number, because the mean of its divisors is an integer number (10605600915).

Almost surely, 2^21211201829 is an apocalyptic number.

It is an amenable number.

21211201829 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211201829 is an equidigital number, since it uses as much as digits as its factorization.

21211201829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 21211201829 in words is "twenty-one billion, two hundred eleven million, two hundred one thousand, eight hundred twenty-nine".