21000010111 has 8 divisors (see below), whose sum is σ = 21786368000. Its totient is φ = 20220460920.

The previous prime is 21000010103. The next prime is 21000010133. The reversal of 21000010111 is 11101000012.

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

It is a cyclic number.

It is not a de Polignac number, because 21000010111 - 2³ = 21000010103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000010094 and 21000010103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000010411) 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, 1695891 + ... + 1708228.

It is an arithmetic number, because the mean of its divisors is an integer number (2723296000).

Almost surely, 2^21000010111 is an apocalyptic number.

21000010111 is a deficient number, since it is larger than the sum of its proper divisors (786357889).

21000010111 is a wasteful number, since it uses less digits than its factorization.

21000010111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3404349.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 21000010111 its reverse (11101000012), we get a palindrome (32101010123).

The spelling of 21000010111 in words is "twenty-one billion, ten thousand, one hundred eleven".