21143061 has 12 divisors (see below), whose sum is σ = 30614688. Its totient is φ = 14060904.

The previous prime is 21143051. The next prime is 21143069. The reversal of 21143061 is 16034112.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21143061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143069) 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 11 ways as a sum of consecutive naturals, for example, 1336 + ... + 6638.

It is an arithmetic number, because the mean of its divisors is an integer number (2551224).

Almost surely, 2^21143061 is an apocalyptic number.

It is an amenable number.

21143061 is a deficient number, since it is larger than the sum of its proper divisors (9471627).

21143061 is a wasteful number, since it uses less digits than its factorization.

21143061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5752 (or 5749 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21143061 is about 4598.1584357218. The cubic root of 21143061 is about 276.5174994674.

Adding to 21143061 its reverse (16034112), we get a palindrome (37177173).

The spelling of 21143061 in words is "twenty-one million, one hundred forty-three thousand, sixty-one".