21143141 has 4 divisors (see below), whose sum is σ = 22062432. Its totient is φ = 20223852.

The previous prime is 21143137. The next prime is 21143179. The reversal of 21143141 is 14134112.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 21143141 - 2² = 21143137 is a prime.

It is a super-2 number, since 2×21143141² = 894064822691762, 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 (21142141) 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, 459611 + ... + 459656.

It is an arithmetic number, because the mean of its divisors is an integer number (5515608).

Almost surely, 2^21143141 is an apocalyptic number.

It is an amenable number.

21143141 is a deficient number, since it is larger than the sum of its proper divisors (919291).

21143141 is an equidigital number, since it uses as much as digits as its factorization.

21143141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919290.

The product of its digits is 96, while the sum is 17.

The square root of 21143141 is about 4598.1671348484. The cubic root of 21143141 is about 276.5178482244.

Adding to 21143141 its reverse (14134112), we get a palindrome (35277253).

The spelling of 21143141 in words is "twenty-one million, one hundred forty-three thousand, one hundred forty-one".