21011160731 has 8 divisors (see below), whose sum is σ = 23408953344. Its totient is φ = 18694649320.

The previous prime is 21011160719. The next prime is 21011160809. The reversal of 21011160731 is 13706111012.

It is a happy number.

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 21011160731 - 2¹⁴ = 21011144347 is a prime.

It is a super-2 number, since 2×21011160731² (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 = 21011160697 and 21011160706.

It is not an unprimeable number, because it can be changed into a prime (21011163731) 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, 20319755 + ... + 20320788.

It is an arithmetic number, because the mean of its divisors is an integer number (2926119168).

Almost surely, 2^21011160731 is an apocalyptic number.

21011160731 is a deficient number, since it is larger than the sum of its proper divisors (2397792613).

21011160731 is a wasteful number, since it uses less digits than its factorization.

21011160731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40640601.

The product of its (nonzero) digits is 252, while the sum is 23.

Adding to 21011160731 its reverse (13706111012), we get a palindrome (34717271743).

The spelling of 21011160731 in words is "twenty-one billion, eleven million, one hundred sixty thousand, seven hundred thirty-one".