21121240222243 has 8 divisors (see below), whose sum is σ = 24170279787360. Its totient is φ = 18080130540480.

The previous prime is 21121240222241. The next prime is 21121240222253. The reversal of 21121240222243 is 34222204212112.

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 21121240222243 - 2¹ = 21121240222241 is a prime.

It is a super-2 number, since 2×21121240222243² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121240222241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1982465128 + ... + 1982475781.

It is an arithmetic number, because the mean of its divisors is an integer number (3021284973420).

Almost surely, 2^{21121240222243} is an apocalyptic number.

21121240222243 is a deficient number, since it is larger than the sum of its proper divisors (3049039565117).

21121240222243 is an equidigital number, since it uses as much as digits as its factorization.

21121240222243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3964941677.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 21121240222243 its reverse (34222204212112), we get a palindrome (55343444434355).

The spelling of 21121240222243 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred forty million, two hundred twenty-two thousand, two hundred forty-three".