21110333021021 has 2 divisors, whose sum is σ = 21110333021022. Its totient is φ = 21110333021020.

The previous prime is 21110333020999. The next prime is 21110333021023. The reversal of 21110333021021 is 12012033301112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19756691522500 + 1353641498521 = 4444850^2 + 1163461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110333021021 is a prime.

Together with 21110333021023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110333020984 and 21110333021002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110333021023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555166510510 + 10555166510511.

It is an arithmetic number, because the mean of its divisors is an integer number (10555166510511).

Almost surely, 2^{21110333021021} is an apocalyptic number.

It is an amenable number.

21110333021021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110333021021 is an equidigital number, since it uses as much as digits as its factorization.

21110333021021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21110333021021 its reverse (12012033301112), we get a palindrome (33122366322133).

The spelling of 21110333021021 in words is "twenty-one trillion, one hundred ten billion, three hundred thirty-three million, twenty-one thousand, twenty-one".