21010223323121 has 16 divisors (see below), whose sum is σ = 21191936808960. Its totient is φ = 20829288621120.

The previous prime is 21010223323091. The next prime is 21010223323147. The reversal of 21010223323121 is 12132332201012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010223323121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010223323181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266185700 + ... + 266264618.

It is an arithmetic number, because the mean of its divisors is an integer number (1324496050560).

Almost surely, 2^{21010223323121} is an apocalyptic number.

It is an amenable number.

21010223323121 is a deficient number, since it is larger than the sum of its proper divisors (181713485839).

21010223323121 is a wasteful number, since it uses less digits than its factorization.

21010223323121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83824.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21010223323121 its reverse (12132332201012), we get a palindrome (33142555524133).

The spelling of 21010223323121 in words is "twenty-one trillion, ten billion, two hundred twenty-three million, three hundred twenty-three thousand, one hundred twenty-one".