21241404331 has 32 divisors (see below), whose sum is σ = 26235371520. Its totient is φ = 16792336800.

The previous prime is 21241404299. The next prime is 21241404343. The reversal of 21241404331 is 13340414212.

It is not a de Polignac number, because 21241404331 - 2⁵ = 21241404299 is a prime.

It is a super-2 number, since 2×21241404331² (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 = 21241404296 and 21241404305.

It is not an unprimeable number, because it can be changed into a prime (21241404361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1185046 + ... + 1202836.

It is an arithmetic number, because the mean of its divisors is an integer number (819855360).

Almost surely, 2^21241404331 is an apocalyptic number.

21241404331 is a deficient number, since it is larger than the sum of its proper divisors (4993967189).

21241404331 is a wasteful number, since it uses less digits than its factorization.

21241404331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18055.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21241404331 its reverse (13340414212), we get a palindrome (34581818543).

The spelling of 21241404331 in words is "twenty-one billion, two hundred forty-one million, four hundred four thousand, three hundred thirty-one".