21211211120212 has 24 divisors (see below), whose sum is σ = 38887832797632. Its totient is φ = 10104075960000.

The previous prime is 21211211120207. The next prime is 21211211120221. The reversal of 21211211120212 is 21202111211212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211211120212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459253089 + ... + 459299272.

It is an arithmetic number, because the mean of its divisors is an integer number (1620326366568).

Almost surely, 2^{21211211120212} is an apocalyptic number.

It is an amenable number.

21211211120212 is a deficient number, since it is larger than the sum of its proper divisors (17676621677420).

21211211120212 is a wasteful number, since it uses less digits than its factorization.

21211211120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918552639 (or 918552637 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21211211120212 its reverse (21202111211212), we get a palindrome (42413322331424).

The spelling of 21211211120212 in words is "twenty-one trillion, two hundred eleven billion, two hundred eleven million, one hundred twenty thousand, two hundred twelve".