21031244011 has 8 divisors (see below), whose sum is σ = 21601062000. Its totient is φ = 20464133760.

The previous prime is 21031243979. The next prime is 21031244021. The reversal of 21031244011 is 11044213012.

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 21031244011 - 2⁵ = 21031243979 is a prime.

It is a super-3 number, since 3×21031244011³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21031244011.

It is not an unprimeable number, because it can be changed into a prime (21031244021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661186 + ... + 692263.

It is an arithmetic number, because the mean of its divisors is an integer number (2700132750).

Almost surely, 2^21031244011 is an apocalyptic number.

21031244011 is a deficient number, since it is larger than the sum of its proper divisors (569817989).

21031244011 is a wasteful number, since it uses less digits than its factorization.

21031244011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353869.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21031244011 its reverse (11044213012), we get a palindrome (32075457023).

The spelling of 21031244011 in words is "twenty-one billion, thirty-one million, two hundred forty-four thousand, eleven".