21421320122243 has 8 divisors (see below), whose sum is σ = 21924656580288. Its totient is φ = 20918218492584.

The previous prime is 21421320122227. The next prime is 21421320122297. The reversal of 21421320122243 is 34222102312412.

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 21421320122243 - 2⁴ = 21421320122227 is a prime.

It is a super-2 number, since 2×21421320122243² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21421820122243) 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, 58522505 + ... + 58887402.

It is an arithmetic number, because the mean of its divisors is an integer number (2740582072536).

Almost surely, 2^{21421320122243} is an apocalyptic number.

21421320122243 is a deficient number, since it is larger than the sum of its proper divisors (503336458045).

21421320122243 is a wasteful number, since it uses less digits than its factorization.

21421320122243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117414193.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21421320122243 its reverse (34222102312412), we get a palindrome (55643422434655).

The spelling of 21421320122243 in words is "twenty-one trillion, four hundred twenty-one billion, three hundred twenty million, one hundred twenty-two thousand, two hundred forty-three".