21165044229 has 16 divisors (see below), whose sum is σ = 35834995840. Its totient is φ = 12094310880.

The previous prime is 21165044209. The next prime is 21165044269. The reversal of 21165044229 is 92244056112.

It is a happy number.

It is not a de Polignac number, because 21165044229 - 2⁸ = 21165043973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21165044193 and 21165044202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21165044209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55991992 + ... + 55992369.

It is an arithmetic number, because the mean of its divisors is an integer number (2239687240).

Almost surely, 2^21165044229 is an apocalyptic number.

It is an amenable number.

21165044229 is a deficient number, since it is larger than the sum of its proper divisors (14669951611).

21165044229 is a wasteful number, since it uses less digits than its factorization.

21165044229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111984377 (or 111984371 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 21165044229 in words is "twenty-one billion, one hundred sixty-five million, forty-four thousand, two hundred twenty-nine".