21034111 has 8 divisors (see below), whose sum is σ = 24174720. Its totient is φ = 17927448.

The previous prime is 21034067. The next prime is 21034129. The reversal of 21034111 is 11143012.

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

It is not a de Polignac number, because 21034111 - 2⁹ = 21033599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21034091 and 21034100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034411) 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, 7141 + ... + 9646.

It is an arithmetic number, because the mean of its divisors is an integer number (3021840).

Almost surely, 2^21034111 is an apocalyptic number.

21034111 is a deficient number, since it is larger than the sum of its proper divisors (3140609).

21034111 is a wasteful number, since it uses less digits than its factorization.

21034111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16973.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21034111 is about 4586.2960000419. The cubic root of 21034111 is about 276.0417172466.

Adding to 21034111 its reverse (11143012), we get a palindrome (32177123).

The spelling of 21034111 in words is "twenty-one million, thirty-four thousand, one hundred eleven".