21055104730 has 48 divisors (see below), whose sum is σ = 41845128192. Its totient is φ = 7621970400.

The previous prime is 21055104709. The next prime is 21055104859. The reversal of 21055104730 is 3740155012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 230815 + ... + 308845.

It is an arithmetic number, because the mean of its divisors is an integer number (871773504).

Almost surely, 2^21055104730 is an apocalyptic number.

21055104730 is a deficient number, since it is larger than the sum of its proper divisors (20790023462).

21055104730 is a wasteful number, since it uses less digits than its factorization.

21055104730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78283 (or 78272 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

Adding to 21055104730 its reverse (3740155012), we get a palindrome (24795259742).

The spelling of 21055104730 in words is "twenty-one billion, fifty-five million, one hundred four thousand, seven hundred thirty".