21745135043 has 8 divisors (see below), whose sum is σ = 21813094800. Its totient is φ = 21677252608.

The previous prime is 21745135033. The next prime is 21745135063. The reversal of 21745135043 is 34053154712.

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-21745135043 is a prime.

It is a super-2 number, since 2×21745135043² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21745134994 and 21745135012.

It is not an unprimeable number, because it can be changed into a prime (21745135033) 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, 571955 + ... + 608787.

It is an arithmetic number, because the mean of its divisors is an integer number (2726636850).

Almost surely, 2^21745135043 is an apocalyptic number.

21745135043 is a deficient number, since it is larger than the sum of its proper divisors (67959757).

21745135043 is a wasteful number, since it uses less digits than its factorization.

21745135043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38661.

The product of its (nonzero) digits is 50400, while the sum is 35.

Adding to 21745135043 its reverse (34053154712), we get a palindrome (55798289755).

The spelling of 21745135043 in words is "twenty-one billion, seven hundred forty-five million, one hundred thirty-five thousand, forty-three".