21092028209 has 16 divisors (see below), whose sum is σ = 24491698560. Its totient is φ = 17790917760.

The previous prime is 21092028161. The next prime is 21092028211. The reversal of 21092028209 is 90282029012.

It is not a de Polignac number, because 21092028209 - 2¹⁶ = 21091962673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21092028709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51227 + ... + 211679.

It is an arithmetic number, because the mean of its divisors is an integer number (1530731160).

Almost surely, 2^21092028209 is an apocalyptic number.

It is an amenable number.

21092028209 is a deficient number, since it is larger than the sum of its proper divisors (3399670351).

21092028209 is a wasteful number, since it uses less digits than its factorization.

21092028209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160760.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 21092028209 in words is "twenty-one billion, ninety-two million, twenty-eight thousand, two hundred nine".