21731797241 has 8 divisors (see below), whose sum is σ = 27094188864. Its totient is φ = 16933867920.

The previous prime is 21731797223. The next prime is 21731797253. The reversal of 21731797241 is 14279713712.

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-21731797241 is a prime.

It is a super-2 number, since 2×21731797241² (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 = 21731797192 and 21731797201.

It is not an unprimeable number, because it can be changed into a prime (21731797141) 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, 141115490 + ... + 141115643.

It is an arithmetic number, because the mean of its divisors is an integer number (3386773608).

Almost surely, 2^21731797241 is an apocalyptic number.

It is an amenable number.

21731797241 is a deficient number, since it is larger than the sum of its proper divisors (5362391623).

21731797241 is a wasteful number, since it uses less digits than its factorization.

21731797241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282231151.

The product of its digits is 148176, while the sum is 44.

The spelling of 21731797241 in words is "twenty-one billion, seven hundred thirty-one million, seven hundred ninety-seven thousand, two hundred forty-one".