21202920109 has 8 divisors (see below), whose sum is σ = 24233542848. Its totient is φ = 18172705920.

The previous prime is 21202920107. The next prime is 21202920119. The reversal of 21202920109 is 90102920212.

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 21202920109 - 2¹ = 21202920107 is a prime.

It is a super-2 number, since 2×21202920109² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202920107) 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, 18594 + ... + 206764.

It is an arithmetic number, because the mean of its divisors is an integer number (3029192856).

Almost surely, 2^21202920109 is an apocalyptic number.

It is an amenable number.

21202920109 is a deficient number, since it is larger than the sum of its proper divisors (3030622739).

21202920109 is a wasteful number, since it uses less digits than its factorization.

21202920109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204275.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 21202920109 in words is "twenty-one billion, two hundred two million, nine hundred twenty thousand, one hundred nine".