21010001029 has 2 divisors, whose sum is σ = 21010001030. Its totient is φ = 21010001028.

The previous prime is 21010001011. The next prime is 21010001041. The reversal of 21010001029 is 92010001012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18768452004 + 2241549025 = 136998^2 + 47345^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010001029 - 2¹³ = 21009992837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010001329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505000514 + 10505000515.

It is an arithmetic number, because the mean of its divisors is an integer number (10505000515).

Almost surely, 2^21010001029 is an apocalyptic number.

It is an amenable number.

21010001029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010001029 is an equidigital number, since it uses as much as digits as its factorization.

21010001029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 21010001029 in words is "twenty-one billion, ten million, one thousand, twenty-nine".