21141243243 has 12 divisors (see below), whose sum is σ = 31668364728. Its totient is φ = 14094162000.

The previous prime is 21141243229. The next prime is 21141243271. The reversal of 21141243243 is 34234214112.

21141243243 is a `hidden beast` number, since 2 + 1 + 1 + 412 + 4 + 3 + 243 = 666.

It is not a de Polignac number, because 21141243243 - 2¹³ = 21141235051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

21141243243 is a modest number, since divided by 243243 gives 21141 as remainder.

It is not an unprimeable number, because it can be changed into a prime (21141243203) 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 11 ways as a sum of consecutive naturals, for example, 43500258 + ... + 43500743.

It is an arithmetic number, because the mean of its divisors is an integer number (2639030394).

Almost surely, 2^21141243243 is an apocalyptic number.

21141243243 is a deficient number, since it is larger than the sum of its proper divisors (10527121485).

21141243243 is an frugal number, since it uses more digits than its factorization.

21141243243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87001016 (or 87001004 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21141243243 its reverse (34234214112), we get a palindrome (55375457355).

The spelling of 21141243243 in words is "twenty-one billion, one hundred forty-one million, two hundred forty-three thousand, two hundred forty-three".