1221100220122 has 16 divisors (see below), whose sum is σ = 1939598216640. Its totient is φ = 574952322528.

The previous prime is 1221100220113. The next prime is 1221100220167. The reversal of 1221100220122 is 2210220011221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221100220096 and 1221100220105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96203883 + ... + 96216574.

It is an arithmetic number, because the mean of its divisors is an integer number (121224888540).

Almost surely, 2^{1221100220122} is an apocalyptic number.

1221100220122 is a deficient number, since it is larger than the sum of its proper divisors (718497996518).

1221100220122 is a wasteful number, since it uses less digits than its factorization.

1221100220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192420645.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221100220122 its reverse (2210220011221), we get a palindrome (3431320231343).

The spelling of 1221100220122 in words is "one trillion, two hundred twenty-one billion, one hundred million, two hundred twenty thousand, one hundred twenty-two".