21111304432344 has 64 divisors (see below), whose sum is σ = 61144286845440. Its totient is φ = 5949173848320.

The previous prime is 21111304432313. The next prime is 21111304432459. The reversal of 21111304432344 is 44323440311112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 860689972 + ... + 860714499.

It is an arithmetic number, because the mean of its divisors is an integer number (955379481960).

Almost surely, 2^{21111304432344} is an apocalyptic number.

21111304432344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21111304432344 is an abundant number, since it is smaller than the sum of its proper divisors (40032982413096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111304432344 is a wasteful number, since it uses less digits than its factorization.

21111304432344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721404560 (or 1721404556 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

Adding to 21111304432344 its reverse (44323440311112), we get a palindrome (65434744743456).

The spelling of 21111304432344 in words is "twenty-one trillion, one hundred eleven billion, three hundred four million, four hundred thirty-two thousand, three hundred forty-four".