21121020229 has 2 divisors, whose sum is σ = 21121020230. Its totient is φ = 21121020228.

The previous prime is 21121020211. The next prime is 21121020233. The reversal of 21121020229 is 92202012112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16294522500 + 4826497729 = 127650^2 + 69473^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121020229 - 2⁷ = 21121020101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121020259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560510114 + 10560510115.

It is an arithmetic number, because the mean of its divisors is an integer number (10560510115).

Almost surely, 2^21121020229 is an apocalyptic number.

It is an amenable number.

21121020229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121020229 is an equidigital number, since it uses as much as digits as its factorization.

21121020229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21121020229 in words is "twenty-one billion, one hundred twenty-one million, twenty thousand, two hundred twenty-nine".