21201110211212 has 48 divisors (see below), whose sum is σ = 37640912010240. Its totient is φ = 10447735233600.

The previous prime is 21201110211163. The next prime is 21201110211227. The reversal of 21201110211212 is 21211201110212.

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 15 ways as a sum of consecutive naturals, for example, 65560037 + ... + 65882627.

It is an arithmetic number, because the mean of its divisors is an integer number (784185666880).

Almost surely, 2^{21201110211212} is an apocalyptic number.

It is an amenable number.

21201110211212 is a deficient number, since it is larger than the sum of its proper divisors (16439801799028).

21201110211212 is a wasteful number, since it uses less digits than its factorization.

21201110211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323502 (or 323500 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21201110211212 its reverse (21211201110212), we get a palindrome (42412311321424).

The spelling of 21201110211212 in words is "twenty-one trillion, two hundred one billion, one hundred ten million, two hundred eleven thousand, two hundred twelve".