21103331244 has 12 divisors (see below), whose sum is σ = 49241106264. Its totient is φ = 7034443744.

The previous prime is 21103331239. The next prime is 21103331281. The reversal of 21103331244 is 44213330112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879305457 + ... + 879305480.

It is an arithmetic number, because the mean of its divisors is an integer number (4103425522).

Almost surely, 2^21103331244 is an apocalyptic number.

It is an amenable number.

21103331244 is an abundant number, since it is smaller than the sum of its proper divisors (28137775020).

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

21103331244 is a wasteful number, since it uses less digits than its factorization.

21103331244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758610944 (or 1758610942 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21103331244 its reverse (44213330112), we get a palindrome (65316661356).

The spelling of 21103331244 in words is "twenty-one billion, one hundred three million, three hundred thirty-one thousand, two hundred forty-four".