21016011 has 8 divisors (see below), whose sum is σ = 28118160. Its totient is φ = 13962272.

The previous prime is 21016007. The next prime is 21016013. The reversal of 21016011 is 11061012.

It is a happy number.

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 21016011 - 2² = 21016007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21016013) 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, 11076 + ... + 12833.

It is an arithmetic number, because the mean of its divisors is an integer number (3514770).

Almost surely, 2^21016011 is an apocalyptic number.

21016011 is a deficient number, since it is larger than the sum of its proper divisors (7102149).

21016011 is a wasteful number, since it uses less digits than its factorization.

21016011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24205.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 21016011 is about 4584.3223054231. The cubic root of 21016011 is about 275.9625159134.

Adding to 21016011 its reverse (11061012), we get a palindrome (32077023).

The spelling of 21016011 in words is "twenty-one million, sixteen thousand, eleven".