21115496044 has 12 divisors (see below), whose sum is σ = 36957387600. Its totient is φ = 10556242448.

The previous prime is 21115496033. The next prime is 21115496047. The reversal of 21115496044 is 44069451112.

It is a junction number, because it is equal to n+sod(n) for n = 21115495994 and 21115496012.

It is not an unprimeable number, because it can be changed into a prime (21115496047) 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, 344539 + ... + 401170.

It is an arithmetic number, because the mean of its divisors is an integer number (3079782300).

Almost surely, 2^21115496044 is an apocalyptic number.

It is an amenable number.

21115496044 is a deficient number, since it is larger than the sum of its proper divisors (15841891556).

21115496044 is a wasteful number, since it uses less digits than its factorization.

21115496044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752792 (or 752790 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 21115496044 in words is "twenty-one billion, one hundred fifteen million, four hundred ninety-six thousand, forty-four".