21221023021043 has 2 divisors, whose sum is σ = 21221023021044. Its totient is φ = 21221023021042.

The previous prime is 21221023021001. The next prime is 21221023021087. The reversal of 21221023021043 is 34012032012212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221023021043 - 2¹⁴ = 21221023004659 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221023023043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610511510521 + 10610511510522.

It is an arithmetic number, because the mean of its divisors is an integer number (10610511510522).

Almost surely, 2^{21221023021043} is an apocalyptic number.

21221023021043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221023021043 is an equidigital number, since it uses as much as digits as its factorization.

21221023021043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21221023021043 its reverse (34012032012212), we get a palindrome (55233055033255).

The spelling of 21221023021043 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-three million, twenty-one thousand, forty-three".