21099294688 has 12 divisors (see below), whose sum is σ = 41539236480. Its totient is φ = 10549647328.

The previous prime is 21099294673. The next prime is 21099294719. The reversal of 21099294688 is 88649299012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329676448 + ... + 329676511.

It is an arithmetic number, because the mean of its divisors is an integer number (3461603040).

Almost surely, 2^21099294688 is an apocalyptic number.

It is an amenable number.

21099294688 is a deficient number, since it is larger than the sum of its proper divisors (20439941792).

21099294688 is an equidigital number, since it uses as much as digits as its factorization.

21099294688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659352969 (or 659352961 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 58.

The spelling of 21099294688 in words is "twenty-one billion, ninety-nine million, two hundred ninety-four thousand, six hundred eighty-eight".