1221012220122 has 24 divisors (see below), whose sum is σ = 2671211204064. Its totient is φ = 403052576904.

The previous prime is 1221012220081. The next prime is 1221012220139. The reversal of 1221012220122 is 2210222101221.

It is a happy number.

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 = 1221012220095 and 1221012220104.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329289468 + ... + 329293175.

It is an arithmetic number, because the mean of its divisors is an integer number (111300466836).

Almost surely, 2^{1221012220122} is an apocalyptic number.

1221012220122 is an abundant number, since it is smaller than the sum of its proper divisors (1450198983942).

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

1221012220122 is a wasteful number, since it uses less digits than its factorization.

1221012220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658582754 (or 658582751 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221012220122 its reverse (2210222101221), we get a palindrome (3431234321343).

The spelling of 1221012220122 in words is "one trillion, two hundred twenty-one billion, twelve million, two hundred twenty thousand, one hundred twenty-two".