21012203334 has 16 divisors (see below), whose sum is σ = 43851555072. Its totient is φ = 6699543048.

The previous prime is 21012203299. The next prime is 21012203353. The reversal of 21012203334 is 43330221012.

It is a self number, because there is not a number n which added to its sum of digits gives 21012203334.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 76131034 + ... + 76131309.

It is an arithmetic number, because the mean of its divisors is an integer number (2740722192).

Almost surely, 2^21012203334 is an apocalyptic number.

21012203334 is an abundant number, since it is smaller than the sum of its proper divisors (22839351738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012203334 is a wasteful number, since it uses less digits than its factorization.

21012203334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152262371.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21012203334 its reverse (43330221012), we get a palindrome (64342424346).

The spelling of 21012203334 in words is "twenty-one billion, twelve million, two hundred three thousand, three hundred thirty-four".