21423021140243 has 8 divisors (see below), whose sum is σ = 21474492715200. Its totient is φ = 21371571986688.

The previous prime is 21423021140233. The next prime is 21423021140249. The reversal of 21423021140243 is 34204112032412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21423021140243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21423021140249) 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, 3691328 + ... + 7514781.

It is an arithmetic number, because the mean of its divisors is an integer number (2684311589400).

Almost surely, 2^{21423021140243} is an apocalyptic number.

21423021140243 is a deficient number, since it is larger than the sum of its proper divisors (51471574957).

21423021140243 is a wasteful number, since it uses less digits than its factorization.

21423021140243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11210701.

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

Adding to 21423021140243 its reverse (34204112032412), we get a palindrome (55627133172655).

The spelling of 21423021140243 in words is "twenty-one trillion, four hundred twenty-three billion, twenty-one million, one hundred forty thousand, two hundred forty-three".