1221122012212 has 24 divisors (see below), whose sum is σ = 2205948389120. Its totient is φ = 590851946880.

The previous prime is 1221122012189. The next prime is 1221122012213. The reversal of 1221122012212 is 2122102211221.

It is a super-2 number, since 2×1221122012212² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221122012212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221122012213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7245964 + ... + 7412572.

Almost surely, 2^{1221122012212} is an apocalyptic number.

It is an amenable number.

1221122012212 is a deficient number, since it is larger than the sum of its proper divisors (984826376908).

1221122012212 is a wasteful number, since it uses less digits than its factorization.

1221122012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225751 (or 225749 counting only the distinct ones).

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

Adding to 1221122012212 its reverse (2122102211221), we get a palindrome (3343224223433).

The spelling of 1221122012212 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, twelve thousand, two hundred twelve".