21202122101212 has 24 divisors (see below), whose sum is σ = 39957970912272. Its totient is φ = 9785564102400.

The previous prime is 21202122101207. The next prime is 21202122101233. The reversal of 21202122101212 is 21210122120212.

It is a self number, because there is not a number n which added to its sum of digits gives 21202122101212.

It is a congruent number.

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, 30791412 + ... + 31472452.

It is an arithmetic number, because the mean of its divisors is an integer number (1664915454678).

Almost surely, 2^{21202122101212} is an apocalyptic number.

It is an amenable number.

21202122101212 is a deficient number, since it is larger than the sum of its proper divisors (18755848811060).

21202122101212 is a wasteful number, since it uses less digits than its factorization.

21202122101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279749 (or 1279747 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21202122101212 its reverse (21210122120212), we get a palindrome (42412244221424).

The spelling of 21202122101212 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-two million, one hundred one thousand, two hundred twelve".