1221100000122 has 48 divisors (see below), whose sum is σ = 2516987027520. Its totient is φ = 394928324352.

The previous prime is 1221100000063. The next prime is 1221100000139. The reversal of 1221100000122 is 2210000011221.

It is a junction number, because it is equal to n+sod(n) for n = 1221100000098 and 1221100000107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2741778 + ... + 3155874.

It is an arithmetic number, because the mean of its divisors is an integer number (52437229740).

Almost surely, 2^{1221100000122} is an apocalyptic number.

1221100000122 is an abundant number, since it is smaller than the sum of its proper divisors (1295887027398).

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

1221100000122 is a wasteful number, since it uses less digits than its factorization.

1221100000122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414535 (or 414498 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1221100000122 its reverse (2210000011221), we get a palindrome (3431100011343).

The spelling of 1221100000122 in words is "one trillion, two hundred twenty-one billion, one hundred million, one hundred twenty-two", and thus it is an aban number.