21021001122229 has 2 divisors, whose sum is σ = 21021001122230. Its totient is φ = 21021001122228.

The previous prime is 21021001122137. The next prime is 21021001122263. The reversal of 21021001122229 is 92222110012012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17366014235025 + 3654986887204 = 4167255^2 + 1911802^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021001122229 - 2¹⁹ = 21021000597941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21021001122529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510500561114 + 10510500561115.

It is an arithmetic number, because the mean of its divisors is an integer number (10510500561115).

Almost surely, 2^{21021001122229} is an apocalyptic number.

It is an amenable number.

21021001122229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021001122229 is an equidigital number, since it uses as much as digits as its factorization.

21021001122229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 21021001122229 in words is "twenty-one trillion, twenty-one billion, one million, one hundred twenty-two thousand, two hundred twenty-nine".