21240141 has 16 divisors (see below), whose sum is σ = 30581376. Its totient is φ = 13035456.

The previous prime is 21240133. The next prime is 21240161. The reversal of 21240141 is 14104212.

It is not a de Polignac number, because 21240141 - 2³ = 21240133 is a prime.

It is a super-2 number, since 2×21240141² = 902287179399762, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21240141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240101) 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, 28216 + ... + 28958.

It is an arithmetic number, because the mean of its divisors is an integer number (1911336).

Almost surely, 2^21240141 is an apocalyptic number.

It is an amenable number.

21240141 is a deficient number, since it is larger than the sum of its proper divisors (9341235).

21240141 is a wasteful number, since it uses less digits than its factorization.

21240141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1492.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21240141 is about 4608.7027458928. The cubic root of 21240141 is about 276.9400705324.

Adding to 21240141 its reverse (14104212), we get a palindrome (35344353).

The spelling of 21240141 in words is "twenty-one million, two hundred forty thousand, one hundred forty-one".