21311130541 has 4 divisors (see below), whose sum is σ = 21806738272. Its totient is φ = 20815522812.

The previous prime is 21311130517. The next prime is 21311130551. The reversal of 21311130541 is 14503111312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21311130541 - 2⁷ = 21311130413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311130551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247803801 + ... + 247803886.

It is an arithmetic number, because the mean of its divisors is an integer number (5451684568).

Almost surely, 2^21311130541 is an apocalyptic number.

It is an amenable number.

21311130541 is a deficient number, since it is larger than the sum of its proper divisors (495607731).

21311130541 is an equidigital number, since it uses as much as digits as its factorization.

21311130541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495607730.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 21311130541 its reverse (14503111312), we get a palindrome (35814241853).

The spelling of 21311130541 in words is "twenty-one billion, three hundred eleven million, one hundred thirty thousand, five hundred forty-one".