21210143293 has 2 divisors, whose sum is σ = 21210143294. Its totient is φ = 21210143292.

The previous prime is 21210143249. The next prime is 21210143341. The reversal of 21210143293 is 39234101212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18096168484 + 3113974809 = 134522^2 + 55803^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210143293 - 2²⁵ = 21176588861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210143233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605071646 + 10605071647.

It is an arithmetic number, because the mean of its divisors is an integer number (10605071647).

Almost surely, 2^21210143293 is an apocalyptic number.

It is an amenable number.

21210143293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210143293 is an equidigital number, since it uses as much as digits as its factorization.

21210143293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21210143293 in words is "twenty-one billion, two hundred ten million, one hundred forty-three thousand, two hundred ninety-three".