21211002344 has 16 divisors (see below), whose sum is σ = 45452148000. Its totient is φ = 9090429552.

The previous prime is 21211002343. The next prime is 21211002359. The reversal of 21211002344 is 44320011212.

It is not an unprimeable number, because it can be changed into a prime (21211002343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189383894 + ... + 189384005.

It is an arithmetic number, because the mean of its divisors is an integer number (2840759250).

Almost surely, 2^21211002344 is an apocalyptic number.

It is an amenable number.

21211002344 is an abundant number, since it is smaller than the sum of its proper divisors (24241145656).

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

21211002344 is a wasteful number, since it uses less digits than its factorization.

21211002344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378767912 (or 378767908 counting only the distinct ones).

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

Adding to 21211002344 its reverse (44320011212), we get a palindrome (65531013556).

The spelling of 21211002344 in words is "twenty-one billion, two hundred eleven million, two thousand, three hundred forty-four".