21110427 has 24 divisors (see below), whose sum is σ = 33340944. Its totient is φ = 12792384.

The previous prime is 21110423. The next prime is 21110429. The reversal of 21110427 is 72401112.

It is not a de Polignac number, because 21110427 - 2² = 21110423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21110423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6493 + ... + 9185.

It is an arithmetic number, because the mean of its divisors is an integer number (1389206).

Almost surely, 2^21110427 is an apocalyptic number.

21110427 is a deficient number, since it is larger than the sum of its proper divisors (12230517).

21110427 is a wasteful number, since it uses less digits than its factorization.

21110427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779 (or 2776 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21110427 is about 4594.6084708058. The cubic root of 21110427 is about 276.3751593272.

Adding to 21110427 its reverse (72401112), we get a palindrome (93511539).

The spelling of 21110427 in words is "twenty-one million, one hundred ten thousand, four hundred twenty-seven".