21011110 has 8 divisors (see below), whose sum is σ = 37820016. Its totient is φ = 8404440.

The previous prime is 21011083. The next prime is 21011141. The reversal of 21011110 is 1111012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21011093 and 21011102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050546 + ... + 1050565.

It is an arithmetic number, because the mean of its divisors is an integer number (4727502).

Almost surely, 2^21011110 is an apocalyptic number.

21011110 is a deficient number, since it is larger than the sum of its proper divisors (16808906).

21011110 is a wasteful number, since it uses less digits than its factorization.

21011110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101118.

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

The square root of 21011110 is about 4583.7877350506. The cubic root of 21011110 is about 275.9410624695.

Adding to 21011110 its reverse (1111012), we get a palindrome (22122122).

The spelling of 21011110 in words is "twenty-one million, eleven thousand, one hundred ten".