21001100229989 has 32 divisors (see below), whose sum is σ = 24040841029632. Its totient is φ = 18174868272000.

The previous prime is 21001100229961. The next prime is 21001100230007. The reversal of 21001100229989 is 98992200110012.

It is a de Polignac number, because none of the positive numbers 2^k-21001100229989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001100229959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5519594 + ... + 8512820.

It is an arithmetic number, because the mean of its divisors is an integer number (751276282176).

Almost surely, 2^{21001100229989} is an apocalyptic number.

It is an amenable number.

21001100229989 is a deficient number, since it is larger than the sum of its proper divisors (3039740799643).

21001100229989 is a wasteful number, since it uses less digits than its factorization.

21001100229989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2993657.

The product of its (nonzero) digits is 46656, while the sum is 44.

The spelling of 21001100229989 in words is "twenty-one trillion, one billion, one hundred million, two hundred twenty-nine thousand, nine hundred eighty-nine".