21114641 has 4 divisors (see below), whose sum is σ = 21256500. Its totient is φ = 20972784.

The previous prime is 21114623. The next prime is 21114647. The reversal of 21114641 is 14641112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3441025 + 17673616 = 1855^2 + 4204^2 .

It is a cyclic number.

It is not a de Polignac number, because 21114641 - 2¹⁴ = 21098257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21114647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70706 + ... + 71003.

It is an arithmetic number, because the mean of its divisors is an integer number (5314125).

Almost surely, 2^21114641 is an apocalyptic number.

It is an amenable number.

21114641 is a deficient number, since it is larger than the sum of its proper divisors (141859).

21114641 is a wasteful number, since it uses less digits than its factorization.

21114641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141858.

The product of its digits is 192, while the sum is 20.

The square root of 21114641 is about 4595.0670288909. The cubic root of 21114641 is about 276.3935478300.

Adding to 21114641 its reverse (14641112), we get a palindrome (35755753).

The spelling of 21114641 in words is "twenty-one million, one hundred fourteen thousand, six hundred forty-one".