21992123165 has 8 divisors (see below), whose sum is σ = 26401636608. Its totient is φ = 17586306000.

The previous prime is 21992123161. The next prime is 21992123189. The reversal of 21992123165 is 56132129912.

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

It is not a de Polignac number, because 21992123165 - 2² = 21992123161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21992123161) 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 7 ways as a sum of consecutive naturals, for example, 910961 + ... + 934790.

It is an arithmetic number, because the mean of its divisors is an integer number (3300204576).

Almost surely, 2^21992123165 is an apocalyptic number.

It is an amenable number.

21992123165 is a deficient number, since it is larger than the sum of its proper divisors (4409513443).

21992123165 is a wasteful number, since it uses less digits than its factorization.

21992123165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848139.

The product of its digits is 58320, while the sum is 41.

The spelling of 21992123165 in words is "twenty-one billion, nine hundred ninety-two million, one hundred twenty-three thousand, one hundred sixty-five".