1221020100022 has 16 divisors (see below), whose sum is σ = 2001824226432. Its totient is φ = 556062284160.

The previous prime is 1221020099993. The next prime is 1221020100037. The reversal of 1221020100022 is 2200010201221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221020099975 and 1221020100011.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 579230493 + ... + 579232600.

It is an arithmetic number, because the mean of its divisors is an integer number (125114014152).

Almost surely, 2^{1221020100022} is an apocalyptic number.

1221020100022 is a deficient number, since it is larger than the sum of its proper divisors (780804126410).

1221020100022 is a wasteful number, since it uses less digits than its factorization.

1221020100022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158463143.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1221020100022 its reverse (2200010201221), we get a palindrome (3421030301243).

The spelling of 1221020100022 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred thousand, twenty-two".