1221202111122 has 24 divisors (see below), whose sum is σ = 3023929037376. Its totient is φ = 348914888856.

The previous prime is 1221202110979. The next prime is 1221202111123. The reversal of 1221202111122 is 2211112021221.

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

It is a junction number, because it is equal to n+sod(n) for n = 1221202111095 and 1221202111104.

It is not an unprimeable number, because it can be changed into a prime (1221202111123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4846039998 + ... + 4846040249.

It is an arithmetic number, because the mean of its divisors is an integer number (125997043224).

Almost surely, 2^{1221202111122} is an apocalyptic number.

1221202111122 is an abundant number, since it is smaller than the sum of its proper divisors (1802726926254).

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

1221202111122 is a wasteful number, since it uses less digits than its factorization.

1221202111122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9692080262 (or 9692080259 counting only the distinct ones).

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

Adding to 1221202111122 its reverse (2211112021221), we get a palindrome (3432314132343).

The spelling of 1221202111122 in words is "one trillion, two hundred twenty-one billion, two hundred two million, one hundred eleven thousand, one hundred twenty-two".