1221111022212 has 96 divisors (see below), whose sum is σ = 3296991600000. Its totient is φ = 390363507072.

The previous prime is 1221111022199. The next prime is 1221111022217. The reversal of 1221111022212 is 2122201111221.

It is a super-2 number, since 2×1221111022212² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1221111022217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 841662 + ... + 1774997.

It is an arithmetic number, because the mean of its divisors is an integer number (34343662500).

Almost surely, 2^{1221111022212} is an apocalyptic number.

1221111022212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221111022212 is an abundant number, since it is smaller than the sum of its proper divisors (2075880577788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221111022212 is a wasteful number, since it uses less digits than its factorization.

1221111022212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616850 (or 2616842 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221111022212 its reverse (2122201111221), we get a palindrome (3343312133433).

The spelling of 1221111022212 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, twenty-two thousand, two hundred twelve".