21220000001 has 2 divisors, whose sum is σ = 21220000002. Its totient is φ = 21220000000.

The previous prime is 21219999979. The next prime is 21220000019. The reversal of 21220000001 is 10000002212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14887660225 + 6332339776 = 122015^2 + 79576^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220000001 - 2¹⁰ = 21219998977 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220000051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610000000 + 10610000001.

It is an arithmetic number, because the mean of its divisors is an integer number (10610000001).

Almost surely, 2^21220000001 is an apocalyptic number.

It is an amenable number.

21220000001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220000001 is an equidigital number, since it uses as much as digits as its factorization.

21220000001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 21220000001 its reverse (10000002212), we get a palindrome (31220002213).

It can be divided in two parts, 21 and 220000001, that added together give a palindrome (220000022).

The spelling of 21220000001 in words is "twenty-one billion, two hundred twenty million, one", and thus it is an aban number.