1221111021222 has 12 divisors (see below), whose sum is σ = 2645740546020. Its totient is φ = 407037007068.

The previous prime is 1221111021211. The next prime is 1221111021233. The reversal of 1221111021222 is 2221201111221.

It is an interprime number because it is at equal distance from previous prime (1221111021211) and next prime (1221111021233).

It is a super-2 number, since 2×1221111021222² (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), and also a Moran number because the ratio is a prime number: 67839501179 = 1221111021222 / (1 + 2 + 2 + 1 + 1 + 1 + 1 + 0 + 2 + 1 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 1221111021195 and 1221111021204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33919750572 + ... + 33919750607.

It is an arithmetic number, because the mean of its divisors is an integer number (220478378835).

Almost surely, 2^{1221111021222} is an apocalyptic number.

1221111021222 is an abundant number, since it is smaller than the sum of its proper divisors (1424629524798).

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

1221111021222 is a wasteful number, since it uses less digits than its factorization.

1221111021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67839501187 (or 67839501184 counting only the distinct ones).

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

Adding to 1221111021222 its reverse (2221201111221), we get a palindrome (3442312132443).

The spelling of 1221111021222 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, twenty-one thousand, two hundred twenty-two".