21020243342011 has 8 divisors (see below), whose sum is σ = 21046436837280. Its totient is φ = 20994051866112.

The previous prime is 21020243341997. The next prime is 21020243342027. The reversal of 21020243342011 is 11024334202012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21020243342011 - 2⁷ = 21020243341883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020243342071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20890866 + ... + 21873928.

It is an arithmetic number, because the mean of its divisors is an integer number (2630804604660).

Almost surely, 2^{21020243342011} is an apocalyptic number.

21020243342011 is a deficient number, since it is larger than the sum of its proper divisors (26193495269).

21020243342011 is an equidigital number, since it uses as much as digits as its factorization.

21020243342011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009685.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21020243342011 its reverse (11024334202012), we get a palindrome (32044577544023).

The spelling of 21020243342011 in words is "twenty-one trillion, twenty billion, two hundred forty-three million, three hundred forty-two thousand, eleven".