21221001103 has 2 divisors, whose sum is σ = 21221001104. Its totient is φ = 21221001102.

The previous prime is 21221001101. The next prime is 21221001167. The reversal of 21221001103 is 30110012212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221001103 - 2¹ = 21221001101 is a prime.

Together with 21221001101, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221001101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610500551 + 10610500552.

It is an arithmetic number, because the mean of its divisors is an integer number (10610500552).

Almost surely, 2^21221001103 is an apocalyptic number.

21221001103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221001103 is an equidigital number, since it uses as much as digits as its factorization.

21221001103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21221001103 its reverse (30110012212), we get a palindrome (51331013315).

The spelling of 21221001103 in words is "twenty-one billion, two hundred twenty-one million, one thousand, one hundred three".