21221023021001 has 2 divisors, whose sum is σ = 21221023021002. Its totient is φ = 21221023021000.

The previous prime is 21221023020961. The next prime is 21221023021043. The reversal of 21221023021001 is 10012032012212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17716320773776 + 3504702247225 = 4209076^2 + 1872085^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221023021001 - 2¹⁴ = 21221023004617 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221023051001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610511510500 + 10610511510501.

It is an arithmetic number, because the mean of its divisors is an integer number (10610511510501).

Almost surely, 2^{21221023021001} is an apocalyptic number.

It is an amenable number.

21221023021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221023021001 is an equidigital number, since it uses as much as digits as its factorization.

21221023021001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21221023021001 its reverse (10012032012212), we get a palindrome (31233055033213).

The spelling of 21221023021001 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-three million, twenty-one thousand, one".