21221120100009 has 32 divisors (see below), whose sum is σ = 28955918838528. Its totient is φ = 13819253760000.

The previous prime is 21221120099981. The next prime is 21221120100013. The reversal of 21221120100009 is 90000102112212.

It is not a de Polignac number, because 21221120100009 - 2²¹ = 21221118002857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221120100029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149794809 + ... + 149936409.

It is an arithmetic number, because the mean of its divisors is an integer number (904872463704).

Almost surely, 2^{21221120100009} is an apocalyptic number.

It is an amenable number.

21221120100009 is a deficient number, since it is larger than the sum of its proper divisors (7734798738519).

21221120100009 is a wasteful number, since it uses less digits than its factorization.

21221120100009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145809.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 21221120100009 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, one hundred thousand, nine".