21033100111 has 8 divisors (see below), whose sum is σ = 23442464880. Its totient is φ = 18753971328.

The previous prime is 21033100093. The next prime is 21033100159. The reversal of 21033100111 is 11100133012.

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

It is a de Polignac number, because none of the positive numbers 2^k-21033100111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033100091 and 21033100100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033100211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32558656 + ... + 32559301.

It is an arithmetic number, because the mean of its divisors is an integer number (2930308110).

Almost surely, 2^21033100111 is an apocalyptic number.

21033100111 is a deficient number, since it is larger than the sum of its proper divisors (2409364769).

21033100111 is a wasteful number, since it uses less digits than its factorization.

21033100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65117993.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21033100111 its reverse (11100133012), we get a palindrome (32133233123).

The spelling of 21033100111 in words is "twenty-one billion, thirty-three million, one hundred thousand, one hundred eleven".