21021201010109 has 8 divisors (see below), whose sum is σ = 21419827633152. Its totient is φ = 20622648468240.

The previous prime is 21021201010097. The next prime is 21021201010141. The reversal of 21021201010109 is 90101010212012.

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 21021201010109 - 2⁴ = 21021201010093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21026201010109) 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, 17947229 + ... + 19082594.

It is an arithmetic number, because the mean of its divisors is an integer number (2677478454144).

Almost surely, 2^{21021201010109} is an apocalyptic number.

It is an amenable number.

21021201010109 is a deficient number, since it is larger than the sum of its proper divisors (398626623043).

21021201010109 is a wasteful number, since it uses less digits than its factorization.

21021201010109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37040587.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 21021201010109 in words is "twenty-one trillion, twenty-one billion, two hundred one million, ten thousand, one hundred nine".