21992089209 has 16 divisors (see below), whose sum is σ = 29381826432. Its totient is φ = 14631902208.

The previous prime is 21992089183. The next prime is 21992089211. The reversal of 21992089209 is 90298029912.

It is not a de Polignac number, because 21992089209 - 2¹³ = 21992081017 is a prime.

It is a super-2 number, since 2×21992089209² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21992089289) 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, 4796332 + ... + 4800914.

It is an arithmetic number, because the mean of its divisors is an integer number (1836364152).

Almost surely, 2^21992089209 is an apocalyptic number.

It is an amenable number.

21992089209 is a deficient number, since it is larger than the sum of its proper divisors (7389737223).

21992089209 is a wasteful number, since it uses less digits than its factorization.

21992089209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7456.

The product of its (nonzero) digits is 419904, while the sum is 51.

The spelling of 21992089209 in words is "twenty-one billion, nine hundred ninety-two million, eighty-nine thousand, two hundred nine".