21102012344 has 16 divisors (see below), whose sum is σ = 45218598000. Its totient is φ = 9043719552.

The previous prime is 21102012341. The next prime is 21102012359. The reversal of 21102012344 is 44321020112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102012341) 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 3 ways as a sum of consecutive naturals, for example, 188410769 + ... + 188410880.

It is an arithmetic number, because the mean of its divisors is an integer number (2826162375).

Almost surely, 2^21102012344 is an apocalyptic number.

It is an amenable number.

21102012344 is an abundant number, since it is smaller than the sum of its proper divisors (24116585656).

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

21102012344 is a wasteful number, since it uses less digits than its factorization.

21102012344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376821662 (or 376821658 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21102012344 its reverse (44321020112), we get a palindrome (65423032456).

The spelling of 21102012344 in words is "twenty-one billion, one hundred two million, twelve thousand, three hundred forty-four".