21002432311 has 16 divisors (see below), whose sum is σ = 24439449600. Its totient is φ = 17675329248.

The previous prime is 21002432293. The next prime is 21002432351. The reversal of 21002432311 is 11323420012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21002432311 - 2⁷ = 21002432183 is a prime.

It is a super-2 number, since 2×21002432311² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002432351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311706 + ... + 373048.

It is an arithmetic number, because the mean of its divisors is an integer number (1527465600).

Almost surely, 2^21002432311 is an apocalyptic number.

21002432311 is a deficient number, since it is larger than the sum of its proper divisors (3437017289).

21002432311 is an equidigital number, since it uses as much as digits as its factorization.

21002432311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62238.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21002432311 its reverse (11323420012), we get a palindrome (32325852323).

The spelling of 21002432311 in words is "twenty-one billion, two million, four hundred thirty-two thousand, three hundred eleven".