21016051204 has 12 divisors (see below), whose sum is σ = 37472016204. Its totient is φ = 10309760864.

The previous prime is 21016051187. The next prime is 21016051229. The reversal of 21016051204 is 40215061012.

It can be written as a sum of positive squares in 2 ways, for example, as 18454679104 + 2561372100 = 135848^2 + 50610^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49565947 + ... + 49566370.

It is an arithmetic number, because the mean of its divisors is an integer number (3122668017).

Almost surely, 2^21016051204 is an apocalyptic number.

It is an amenable number.

21016051204 is a deficient number, since it is larger than the sum of its proper divisors (16455965000).

21016051204 is a wasteful number, since it uses less digits than its factorization.

21016051204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99132374 (or 99132372 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The spelling of 21016051204 in words is "twenty-one billion, sixteen million, fifty-one thousand, two hundred four".