21001222103 has 4 divisors (see below), whose sum is σ = 21357175080. Its totient is φ = 20645269128.

The previous prime is 21001222079. The next prime is 21001222127. The reversal of 21001222103 is 30122210012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21001222079) and next prime (21001222127).

It is a cyclic number.

It is not a de Polignac number, because 21001222103 - 2¹⁰ = 21001221079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001222703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177976400 + ... + 177976517.

It is an arithmetic number, because the mean of its divisors is an integer number (5339293770).

Almost surely, 2^21001222103 is an apocalyptic number.

21001222103 is a deficient number, since it is larger than the sum of its proper divisors (355952977).

21001222103 is an equidigital number, since it uses as much as digits as its factorization.

21001222103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355952976.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21001222103 its reverse (30122210012), we get a palindrome (51123432115).

The spelling of 21001222103 in words is "twenty-one billion, one million, two hundred twenty-two thousand, one hundred three".