21203011930 has 16 divisors (see below), whose sum is σ = 38522109600. Its totient is φ = 8401940752.

The previous prime is 21203011903. The next prime is 21203011939. The reversal of 21203011930 is 3911030212.

21203011930 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (21203011939) by changing a digit.

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, 9906880 + ... + 9909019.

It is an arithmetic number, because the mean of its divisors is an integer number (2407631850).

Almost surely, 2^21203011930 is an apocalyptic number.

21203011930 is a deficient number, since it is larger than the sum of its proper divisors (17319097670).

21203011930 is a wasteful number, since it uses less digits than its factorization.

21203011930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19816013.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 21203011930 in words is "twenty-one billion, two hundred three million, eleven thousand, nine hundred thirty".