21244431411 has 40 divisors (see below), whose sum is σ = 38178074880. Its totient is φ = 11500738992.

The previous prime is 21244431407. The next prime is 21244431421. The reversal of 21244431411 is 11413444212.

21244431411 is a `hidden beast` number, since 2 + 1 + 244 + 4 + 3 + 1 + 411 = 666.

It is not a de Polignac number, because 21244431411 - 2² = 21244431407 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21244431421) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 975231 + ... + 996776.

It is an arithmetic number, because the mean of its divisors is an integer number (954451872).

Almost surely, 2^21244431411 is an apocalyptic number.

21244431411 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21244431411 is a deficient number, since it is larger than the sum of its proper divisors (16933643469).

21244431411 is a wasteful number, since it uses less digits than its factorization.

21244431411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972045 (or 1972036 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

Adding to 21244431411 its reverse (11413444212), we get a palindrome (32657875623).

The spelling of 21244431411 in words is "twenty-one billion, two hundred forty-four million, four hundred thirty-one thousand, four hundred eleven".