21098147209 has 8 divisors (see below), whose sum is σ = 21223170752. Its totient is φ = 20973360240.

The previous prime is 21098147207. The next prime is 21098147221. The reversal of 21098147209 is 90274189012.

It is a happy number.

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 21098147209 - 2¹ = 21098147207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21098147201) 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, 121372 + ... + 238594.

It is an arithmetic number, because the mean of its divisors is an integer number (2652896344).

Almost surely, 2^21098147209 is an apocalyptic number.

It is an amenable number.

21098147209 is a deficient number, since it is larger than the sum of its proper divisors (125023543).

21098147209 is a wasteful number, since it uses less digits than its factorization.

21098147209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118287.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 21098147209 in words is "twenty-one billion, ninety-eight million, one hundred forty-seven thousand, two hundred nine".