21002110229 has 4 divisors (see below), whose sum is σ = 21346407180. Its totient is φ = 20657813280.

The previous prime is 21002110219. The next prime is 21002110247. The reversal of 21002110229 is 92201120012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 435682129 + 20566428100 = 20873^2 + 143410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002110229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002110229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002110219) 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 in 3 ways as a sum of consecutive naturals, for example, 172148384 + ... + 172148505.

It is an arithmetic number, because the mean of its divisors is an integer number (5336601795).

Almost surely, 2^21002110229 is an apocalyptic number.

It is an amenable number.

21002110229 is a deficient number, since it is larger than the sum of its proper divisors (344296951).

21002110229 is an equidigital number, since it uses as much as digits as its factorization.

21002110229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344296950.

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

The spelling of 21002110229 in words is "twenty-one billion, two million, one hundred ten thousand, two hundred twenty-nine".