21103212200009 has 4 divisors (see below), whose sum is σ = 21112512868740. Its totient is φ = 21093911531280.

The previous prime is 21103212199961. The next prime is 21103212200029. The reversal of 21103212200009 is 90000221230112.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10078421670409 + 11024790529600 = 3174653^2 + 3320360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103212200009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21103212200029) 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, 4650330962 + ... + 4650335499.

It is an arithmetic number, because the mean of its divisors is an integer number (5278128217185).

Almost surely, 2^{21103212200009} is an apocalyptic number.

It is an amenable number.

21103212200009 is a deficient number, since it is larger than the sum of its proper divisors (9300668731).

21103212200009 is an equidigital number, since it uses as much as digits as its factorization.

21103212200009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9300668730.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21103212200009 in words is "twenty-one trillion, one hundred three billion, two hundred twelve million, two hundred thousand, nine".