21221010010023 has 4 divisors (see below), whose sum is σ = 28294680013368. Its totient is φ = 14147340006680.

The previous prime is 21221010010021. The next prime is 21221010010043. The reversal of 21221010010023 is 32001001012212.

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

It is a cyclic number.

It is not a de Polignac number, because 21221010010023 - 2¹ = 21221010010021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221010009984 and 21221010010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221010010021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3536835001668 + ... + 3536835001673.

It is an arithmetic number, because the mean of its divisors is an integer number (7073670003342).

Almost surely, 2^{21221010010023} is an apocalyptic number.

21221010010023 is a deficient number, since it is larger than the sum of its proper divisors (7073670003345).

21221010010023 is an equidigital number, since it uses as much as digits as its factorization.

21221010010023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7073670003344.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21221010010023 its reverse (32001001012212), we get a palindrome (53222011022235).

The spelling of 21221010010023 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, ten thousand, twenty-three".