21201212022212 has 24 divisors (see below), whose sum is σ = 38381746834200. Its totient is φ = 10235003256576.

The previous prime is 21201212022143. The next prime is 21201212022233. The reversal of 21201212022212 is 21222021210212.

It can be written as a sum of positive squares in 4 ways, for example, as 6172362611776 + 15028849410436 = 2484424^2 + 3876706^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21503198 + ... + 22467530.

It is an arithmetic number, because the mean of its divisors is an integer number (1599239451425).

Almost surely, 2^{21201212022212} is an apocalyptic number.

It is an amenable number.

21201212022212 is a deficient number, since it is larger than the sum of its proper divisors (17180534811988).

21201212022212 is a wasteful number, since it uses less digits than its factorization.

21201212022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153895 (or 1153893 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21201212022212 its reverse (21222021210212), we get a palindrome (42423233232424).

The spelling of 21201212022212 in words is "twenty-one trillion, two hundred one billion, two hundred twelve million, twenty-two thousand, two hundred twelve".