21106506201609 has 8 divisors (see below), whose sum is σ = 28902603087040. Its totient is φ = 13690706725296.

The previous prime is 21106506201601. The next prime is 21106506201611. The reversal of 21106506201609 is 90610260560112.

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

It is not a de Polignac number, because 21106506201609 - 2³ = 21106506201601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21106506201601) 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, 95074352149 + ... + 95074352370.

It is an arithmetic number, because the mean of its divisors is an integer number (3612825385880).

Almost surely, 2^{21106506201609} is an apocalyptic number.

It is an amenable number.

21106506201609 is a deficient number, since it is larger than the sum of its proper divisors (7796096885431).

21106506201609 is a wasteful number, since it uses less digits than its factorization.

21106506201609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190148704559.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 21106506201609 in words is "twenty-one trillion, one hundred six billion, five hundred six million, two hundred one thousand, six hundred nine".