21667141 has 16 divisors (see below), whose sum is σ = 23113728. Its totient is φ = 20286000.

The previous prime is 21667123. The next prime is 21667153. The reversal of 21667141 is 14176612.

It is a cyclic number.

It is not a de Polignac number, because 21667141 - 2¹¹ = 21665093 is a prime.

It is a super-2 number, since 2×21667141² = 938929998227762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21667111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143416 + ... + 143566.

It is an arithmetic number, because the mean of its divisors is an integer number (1444608).

Almost surely, 2^21667141 is an apocalyptic number.

It is an amenable number.

21667141 is a deficient number, since it is larger than the sum of its proper divisors (1446587).

21667141 is a wasteful number, since it uses less digits than its factorization.

21667141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its digits is 2016, while the sum is 28.

The square root of 21667141 is about 4654.7976325507. The cubic root of 21667141 is about 278.7835879546.

The spelling of 21667141 in words is "twenty-one million, six hundred sixty-seven thousand, one hundred forty-one".