21131144411 has 8 divisors (see below), whose sum is σ = 22757876064. Its totient is φ = 19504592640.

The previous prime is 21131144393. The next prime is 21131144423. The reversal of 21131144411 is 11444113112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21131144411 - 2³⁴ = 3951275227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131144311) 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, 293306 + ... + 358176.

It is an arithmetic number, because the mean of its divisors is an integer number (2844734508).

Almost surely, 2^21131144411 is an apocalyptic number.

21131144411 is a deficient number, since it is larger than the sum of its proper divisors (1626731653).

21131144411 is a wasteful number, since it uses less digits than its factorization.

21131144411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89941.

The product of its digits is 384, while the sum is 23.

Adding to 21131144411 its reverse (11444113112), we get a palindrome (32575257523).

The spelling of 21131144411 in words is "twenty-one billion, one hundred thirty-one million, one hundred forty-four thousand, four hundred eleven".