21143051 has 2 divisors, whose sum is σ = 21143052. Its totient is φ = 21143050.

The previous prime is 21143039. The next prime is 21143069. The reversal of 21143051 is 15034112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21143051 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21143071) 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 as a sum of consecutive naturals, namely, 10571525 + 10571526.

It is an arithmetic number, because the mean of its divisors is an integer number (10571526).

Almost surely, 2^21143051 is an apocalyptic number.

21143051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143051 is an equidigital number, since it uses as much as digits as its factorization.

21143051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21143051 is about 4598.1573483299. The cubic root of 21143051 is about 276.5174558727.

Adding to 21143051 its reverse (15034112), we get a palindrome (36177163).

The spelling of 21143051 in words is "twenty-one million, one hundred forty-three thousand, fifty-one".