21030680042 has 16 divisors (see below), whose sum is σ = 33418386432. Its totient is φ = 9891837120.

The previous prime is 21030680029. The next prime is 21030680057. The reversal of 21030680042 is 24008603012.

It is a junction number, because it is equal to n+sod(n) for n = 21030679993 and 21030680020.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85418 + ... + 222165.

It is an arithmetic number, because the mean of its divisors is an integer number (2088649152).

Almost surely, 2^21030680042 is an apocalyptic number.

21030680042 is a deficient number, since it is larger than the sum of its proper divisors (12387706390).

21030680042 is a wasteful number, since it uses less digits than its factorization.

21030680042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309613.

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 21030680042 in words is "twenty-one billion, thirty million, six hundred eighty thousand, forty-two".