21002121100229 has 2 divisors, whose sum is σ = 21002121100230. Its totient is φ = 21002121100228.

The previous prime is 21002121100187. The next prime is 21002121100273. The reversal of 21002121100229 is 92200112120012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14900356569604 + 6101764530625 = 3860098^2 + 2470175^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002121100229 - 2¹² = 21002121096133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002121106229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501060550114 + 10501060550115.

It is an arithmetic number, because the mean of its divisors is an integer number (10501060550115).

Almost surely, 2^{21002121100229} is an apocalyptic number.

It is an amenable number.

21002121100229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002121100229 is an equidigital number, since it uses as much as digits as its factorization.

21002121100229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21002121100229 in words is "twenty-one trillion, two billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-nine".