21091484930 has 16 divisors (see below), whose sum is σ = 37999618560. Its totient is φ = 8428828272.

The previous prime is 21091484879. The next prime is 21091484959. The reversal of 21091484930 is 3948419012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 959300 + ... + 981039.

It is an arithmetic number, because the mean of its divisors is an integer number (2374976160).

Almost surely, 2^21091484930 is an apocalyptic number.

21091484930 is a deficient number, since it is larger than the sum of its proper divisors (16908133630).

21091484930 is a wasteful number, since it uses less digits than its factorization.

21091484930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941433.

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 21091484930 in words is "twenty-one billion, ninety-one million, four hundred eighty-four thousand, nine hundred thirty".