1221100011722 has 32 divisors (see below), whose sum is σ = 1871576340480. Its totient is φ = 597391280640.

The previous prime is 1221100011721. The next prime is 1221100011763. The reversal of 1221100011722 is 2271100011221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221100011694 and 1221100011703.

It is not an unprimeable number, because it can be changed into a prime (1221100011721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24754679 + ... + 24803957.

It is an arithmetic number, because the mean of its divisors is an integer number (58486760640).

Almost surely, 2^{1221100011722} is an apocalyptic number.

1221100011722 is a deficient number, since it is larger than the sum of its proper divisors (650476328758).

1221100011722 is a wasteful number, since it uses less digits than its factorization.

1221100011722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50798.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 1221100011722 its reverse (2271100011221), we get a palindrome (3492200022943).

The spelling of 1221100011722 in words is "one trillion, two hundred twenty-one billion, one hundred million, eleven thousand, seven hundred twenty-two".