21143293 has 2 divisors, whose sum is σ = 21143294. Its totient is φ = 21143292.

The previous prime is 21143281. The next prime is 21143327. The reversal of 21143293 is 39234112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12131289 + 9012004 = 3483^2 + 3002^2 .

It is a cyclic number.

It is not a de Polignac number, because 21143293 - 2⁵ = 21143261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21143203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571646 + 10571647.

It is an arithmetic number, because the mean of its divisors is an integer number (10571647).

Almost surely, 2^21143293 is an apocalyptic number.

It is an amenable number.

21143293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143293 is an equidigital number, since it uses as much as digits as its factorization.

21143293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 21143293 is about 4598.1836631435. The cubic root of 21143293 is about 276.5185108603.

The spelling of 21143293 in words is "twenty-one million, one hundred forty-three thousand, two hundred ninety-three".