21310011 has 12 divisors (see below), whose sum is σ = 31215600. Its totient is φ = 14006160.

The previous prime is 21310007. The next prime is 21310021. The reversal of 21310011 is 11001312.

It is not a de Polignac number, because 21310011 - 2² = 21310007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21309975 and 21310002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16036 + ... + 17313.

It is an arithmetic number, because the mean of its divisors is an integer number (2601300).

Almost surely, 2^21310011 is an apocalyptic number.

21310011 is a deficient number, since it is larger than the sum of its proper divisors (9905589).

21310011 is a wasteful number, since it uses less digits than its factorization.

21310011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33426 (or 33423 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 21310011 is about 4616.2767464700. The cubic root of 21310011 is about 277.2434053705.

Adding to 21310011 its reverse (11001312), we get a palindrome (32311323).

The spelling of 21310011 in words is "twenty-one million, three hundred ten thousand, eleven".