1221012111212 has 12 divisors (see below), whose sum is σ = 2262463617960. Its totient is φ = 574593934656.

The previous prime is 1221012111203. The next prime is 1221012111217. The reversal of 1221012111212 is 2121112101221.

It is a super-2 number, since 2×1221012111212² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (1221012111217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8978030162 + ... + 8978030297.

It is an arithmetic number, because the mean of its divisors is an integer number (188538634830).

Almost surely, 2^{1221012111212} is an apocalyptic number.

It is an amenable number.

1221012111212 is a deficient number, since it is larger than the sum of its proper divisors (1041451506748).

1221012111212 is a wasteful number, since it uses less digits than its factorization.

1221012111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17956060480 (or 17956060478 counting only the distinct ones).

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

Adding to 1221012111212 its reverse (2121112101221), we get a palindrome (3342124212433).

Subtracting 1221012111212 from its reverse (2121112101221), we obtain a palindrome (900099990009).

The spelling of 1221012111212 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred eleven thousand, two hundred twelve".