21001020223 has 2 divisors, whose sum is σ = 21001020224. Its totient is φ = 21001020222.

The previous prime is 21001020197. The next prime is 21001020301. The reversal of 21001020223 is 32202010012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001020223 - 2²⁵ = 20967465791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001080223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500510111 + 10500510112.

It is an arithmetic number, because the mean of its divisors is an integer number (10500510112).

Almost surely, 2^21001020223 is an apocalyptic number.

21001020223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001020223 is an equidigital number, since it uses as much as digits as its factorization.

21001020223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 21001020223 its reverse (32202010012), we get a palindrome (53203030235).

The spelling of 21001020223 in words is "twenty-one billion, one million, twenty thousand, two hundred twenty-three".