21016141 has 4 divisors (see below), whose sum is σ = 21025312. Its totient is φ = 21006972.

The previous prime is 21016139. The next prime is 21016153. The reversal of 21016141 is 14161012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21016141 - 2¹ = 21016139 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2176 + ... + 6838.

It is an arithmetic number, because the mean of its divisors is an integer number (5256328).

Almost surely, 2^21016141 is an apocalyptic number.

It is an amenable number.

21016141 is a deficient number, since it is larger than the sum of its proper divisors (9171).

21016141 is an equidigital number, since it uses as much as digits as its factorization.

21016141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9170.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 21016141 is about 4584.3364841599. The cubic root of 21016141 is about 275.9630849249.

Adding to 21016141 its reverse (14161012), we get a palindrome (35177153).

The spelling of 21016141 in words is "twenty-one million, sixteen thousand, one hundred forty-one".