21742492243 has 8 divisors (see below), whose sum is σ = 22895481600. Its totient is φ = 20590367688.

The previous prime is 21742492241. The next prime is 21742492253. The reversal of 21742492243 is 34229424712.

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 21742492243 - 2¹ = 21742492241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21742492196 and 21742492205.

It is not an unprimeable number, because it can be changed into a prime (21742492241) 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, 164263 + ... + 265456.

It is an arithmetic number, because the mean of its divisors is an integer number (2861935200).

Almost surely, 2^21742492243 is an apocalyptic number.

21742492243 is a deficient number, since it is larger than the sum of its proper divisors (1152989357).

21742492243 is a wasteful number, since it uses less digits than its factorization.

21742492243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432401.

The product of its digits is 193536, while the sum is 40.

The spelling of 21742492243 in words is "twenty-one billion, seven hundred forty-two million, four hundred ninety-two thousand, two hundred forty-three".