21020222807 has 2 divisors, whose sum is σ = 21020222808. Its totient is φ = 21020222806.

The previous prime is 21020222791. The next prime is 21020222833. The reversal of 21020222807 is 70822202012.

It is an a-pointer prime, because the next prime (21020222833) can be obtained adding 21020222807 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020222807 - 2⁴ = 21020222791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020224807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510111403 + 10510111404.

It is an arithmetic number, because the mean of its divisors is an integer number (10510111404).

Almost surely, 2^21020222807 is an apocalyptic number.

21020222807 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020222807 is an equidigital number, since it uses as much as digits as its factorization.

21020222807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 26.

Adding to 21020222807 its reverse (70822202012), we get a palindrome (91842424819).

The spelling of 21020222807 in words is "twenty-one billion, twenty million, two hundred twenty-two thousand, eight hundred seven".