21100004444 has 36 divisors (see below), whose sum is σ = 39460075536. Its totient is φ = 9869865984.

The previous prime is 21100004437. The next prime is 21100004459. The reversal of 21100004444 is 44440000112.

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 11 ways as a sum of consecutive naturals, for example, 138404 + ... + 247700.

Almost surely, 2^21100004444 is an apocalyptic number.

It is an amenable number.

21100004444 is a deficient number, since it is larger than the sum of its proper divisors (18360071092).

21100004444 is a wasteful number, since it uses less digits than its factorization.

21100004444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109502 (or 109483 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21100004444 its reverse (44440000112), we get a palindrome (65540004556).

The spelling of 21100004444 in words is "twenty-one billion, one hundred million, four thousand, four hundred forty-four".