21011012110223 has 2 divisors, whose sum is σ = 21011012110224. Its totient is φ = 21011012110222.

The previous prime is 21011012110213. The next prime is 21011012110243. The reversal of 21011012110223 is 32201121011012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011012110223 is a prime.

It is a super-2 number, since 2×21011012110223² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011012110213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505506055111 + 10505506055112.

It is an arithmetic number, because the mean of its divisors is an integer number (10505506055112).

Almost surely, 2^{21011012110223} is an apocalyptic number.

21011012110223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011012110223 is an equidigital number, since it uses as much as digits as its factorization.

21011012110223 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 17.

Adding to 21011012110223 its reverse (32201121011012), we get a palindrome (53212133121235).

The spelling of 21011012110223 in words is "twenty-one trillion, eleven billion, twelve million, one hundred ten thousand, two hundred twenty-three".