21499682044 has 24 divisors (see below), whose sum is σ = 38377449936. Its totient is φ = 10535952000.

The previous prime is 21499682023. The next prime is 21499682081. The reversal of 21499682044 is 44028699412.

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 7 ways as a sum of consecutive naturals, for example, 88222 + ... + 225349.

It is an arithmetic number, because the mean of its divisors is an integer number (1599060414).

Almost surely, 2^21499682044 is an apocalyptic number.

It is an amenable number.

21499682044 is a deficient number, since it is larger than the sum of its proper divisors (16877767892).

21499682044 is a wasteful number, since it uses less digits than its factorization.

21499682044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313917 (or 313915 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 21499682044 in words is "twenty-one billion, four hundred ninety-nine million, six hundred eighty-two thousand, forty-four".