1221201012212 has 24 divisors (see below), whose sum is σ = 2144037779520. Its totient is φ = 608619795840.

The previous prime is 1221201012191. The next prime is 1221201012217. The reversal of 1221201012212 is 2122101021221.

It is a super-2 number, since 2×1221201012212² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221201012217) 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, 4808537 + ... + 5056127.

It is an arithmetic number, because the mean of its divisors is an integer number (89334907480).

Almost surely, 2^{1221201012212} is an apocalyptic number.

It is an amenable number.

1221201012212 is a deficient number, since it is larger than the sum of its proper divisors (922836767308).

1221201012212 is a wasteful number, since it uses less digits than its factorization.

1221201012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251591 (or 251589 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221201012212 its reverse (2122101021221), we get a palindrome (3343302033433).

Subtracting 1221201012212 from its reverse (2122101021221), we obtain a palindrome (900900009009).

The spelling of 1221201012212 in words is "one trillion, two hundred twenty-one billion, two hundred one million, twelve thousand, two hundred twelve".