21000333212 has 6 divisors (see below), whose sum is σ = 36750583128. Its totient is φ = 10500166604.

The previous prime is 21000333169. The next prime is 21000333227. The reversal of 21000333212 is 21233300012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625041648 + ... + 2625041655.

It is an arithmetic number, because the mean of its divisors is an integer number (6125097188).

Almost surely, 2^21000333212 is an apocalyptic number.

It is an amenable number.

21000333212 is a deficient number, since it is larger than the sum of its proper divisors (15750249916).

21000333212 is a wasteful number, since it uses less digits than its factorization.

21000333212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250083307 (or 5250083305 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21000333212 its reverse (21233300012), we get a palindrome (42233633224).

The spelling of 21000333212 in words is "twenty-one billion, three hundred thirty-three thousand, two hundred twelve".