21204840212 has 24 divisors (see below), whose sum is σ = 37265600736. Its totient is φ = 10557579168.

The previous prime is 21204840187. The next prime is 21204840227.

21204840212 is nontrivially palindromic in base 10.

It is a congruent number.

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, 1847363 + ... + 1858805.

It is an arithmetic number, because the mean of its divisors is an integer number (1552733364).

Almost surely, 2^21204840212 is an apocalyptic number.

It is an amenable number.

21204840212 is a deficient number, since it is larger than the sum of its proper divisors (16060760524).

21204840212 is a wasteful number, since it uses less digits than its factorization.

21204840212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13367 (or 13365 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The spelling of 21204840212 in words is "twenty-one billion, two hundred four million, eight hundred forty thousand, two hundred twelve".