21210120212 has 12 divisors (see below), whose sum is σ = 37143372000. Its totient is φ = 10597728216.

The previous prime is 21210120209. The next prime is 21210120257. The reversal of 21210120212 is 21202101212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1826462 + ... + 1838037.

It is an arithmetic number, because the mean of its divisors is an integer number (3095281000).

Almost surely, 2^21210120212 is an apocalyptic number.

It is an amenable number.

21210120212 is a deficient number, since it is larger than the sum of its proper divisors (15933251788).

21210120212 is a wasteful number, since it uses less digits than its factorization.

21210120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665950 (or 3665948 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210120212 its reverse (21202101212), we get a palindrome (42412221424).

The spelling of 21210120212 in words is "twenty-one billion, two hundred ten million, one hundred twenty thousand, two hundred twelve".