21203205104 has 20 divisors (see below), whose sum is σ = 42083191920. Its totient is φ = 10343026560.

The previous prime is 21203205091. The next prime is 21203205113. The reversal of 21203205104 is 40150230212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16160324 + ... + 16161635.

It is an arithmetic number, because the mean of its divisors is an integer number (2104159596).

Almost surely, 2^21203205104 is an apocalyptic number.

It is an amenable number.

21203205104 is a deficient number, since it is larger than the sum of its proper divisors (20879986816).

21203205104 is a wasteful number, since it uses less digits than its factorization.

21203205104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32322008 (or 32322002 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21203205104 its reverse (40150230212), we get a palindrome (61353435316).

The spelling of 21203205104 in words is "twenty-one billion, two hundred three million, two hundred five thousand, one hundred four".