21020222833 has 2 divisors, whose sum is σ = 21020222834. Its totient is φ = 21020222832.

The previous prime is 21020222807. The next prime is 21020222843. The reversal of 21020222833 is 33822202012.

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., 13426320384 + 7593902449 = 115872^2 + 87143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020222833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21020222798 and 21020222807.

It is not a weakly prime, because it can be changed into another prime (21020222843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510111416 + 10510111417.

It is an arithmetic number, because the mean of its divisors is an integer number (10510111417).

Almost surely, 2^21020222833 is an apocalyptic number.

It is an amenable number.

21020222833 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020222833 is an equidigital number, since it uses as much as digits as its factorization.

21020222833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21020222833 its reverse (33822202012), we get a palindrome (54842424845).

The spelling of 21020222833 in words is "twenty-one billion, twenty million, two hundred twenty-two thousand, eight hundred thirty-three".