21310442511 has 8 divisors (see below), whose sum is σ = 28514327040. Its totient is φ = 14156759832.

The previous prime is 21310442509. The next prime is 21310442521. The reversal of 21310442511 is 11524401312.

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

It is not a de Polignac number, because 21310442511 - 2¹ = 21310442509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310442501) 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, 12549471 + ... + 12551168.

It is an arithmetic number, because the mean of its divisors is an integer number (3564290880).

Almost surely, 2^21310442511 is an apocalyptic number.

21310442511 is a deficient number, since it is larger than the sum of its proper divisors (7203884529).

21310442511 is a wasteful number, since it uses less digits than its factorization.

21310442511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25100925.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21310442511 its reverse (11524401312), we get a palindrome (32834843823).

The spelling of 21310442511 in words is "twenty-one billion, three hundred ten million, four hundred forty-two thousand, five hundred eleven".