21202110029 has 2 divisors, whose sum is σ = 21202110030. Its totient is φ = 21202110028.

The previous prime is 21202110019. The next prime is 21202110043. The reversal of 21202110029 is 92001120212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12483592900 + 8718517129 = 111730^2 + 93373^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202110029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202110019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601055014 + 10601055015.

It is an arithmetic number, because the mean of its divisors is an integer number (10601055015).

Almost surely, 2^21202110029 is an apocalyptic number.

It is an amenable number.

21202110029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202110029 is an equidigital number, since it uses as much as digits as its factorization.

21202110029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21202110029 in words is "twenty-one billion, two hundred two million, one hundred ten thousand, twenty-nine".