1221102220100 has 144 divisors (see below), whose sum is σ = 3255544965120. Its totient is φ = 388189584000.

The previous prime is 1221102220087. The next prime is 1221102220127. The reversal of 1221102220100 is 10222011221.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 351626 + ... + 1601825.

Almost surely, 2^{1221102220100} is an apocalyptic number.

1221102220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221102220100 is an abundant number, since it is smaller than the sum of its proper divisors (2034442745020).

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

1221102220100 is a wasteful number, since it uses less digits than its factorization.

1221102220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953538 (or 1953531 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221102220100 its reverse (10222011221), we get a palindrome (1231324231321).

It can be divided in two parts, 12 and 21102220100, that added together give a palindrome (21102220112).

The spelling of 1221102220100 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty thousand, one hundred".