21221121120009 has 16 divisors (see below), whose sum is σ = 28310891140224. Its totient is φ = 14139384675200.

The previous prime is 21221121120007. The next prime is 21221121120013. The reversal of 21221121120009 is 90002112112212.

It is a cyclic number.

It is not a de Polignac number, because 21221121120009 - 2¹ = 21221121120007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221121120007) 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 15 ways as a sum of consecutive naturals, for example, 41067007 + ... + 41580539.

It is an arithmetic number, because the mean of its divisors is an integer number (1769430696264).

Almost surely, 2^{21221121120009} is an apocalyptic number.

It is an amenable number.

21221121120009 is a deficient number, since it is larger than the sum of its proper divisors (7089770020215).

21221121120009 is a wasteful number, since it uses less digits than its factorization.

21221121120009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521328.

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 21221121120009 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, nine".