21221200101009 has 8 divisors (see below), whose sum is σ = 28362463143840. Its totient is φ = 14113701896096.

The previous prime is 21221200100959. The next prime is 21221200101029. The reversal of 21221200101009 is 90010100212212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221200101009 - 2¹⁶ = 21221200035473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221200101029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8441208012 + ... + 8441210525.

It is an arithmetic number, because the mean of its divisors is an integer number (3545307892980).

Almost surely, 2^{21221200101009} is an apocalyptic number.

It is an amenable number.

21221200101009 is a deficient number, since it is larger than the sum of its proper divisors (7141263042831).

21221200101009 is a wasteful number, since it uses less digits than its factorization.

21221200101009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16882418959.

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

The spelling of 21221200101009 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred one thousand, nine".