1221112021102 has 4 divisors (see below), whose sum is σ = 1831668031656. Its totient is φ = 610556010550.

The previous prime is 1221112021093. The next prime is 1221112021133. The reversal of 1221112021102 is 2011202111221.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1221112021102² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305278005274 + ... + 305278005277.

It is an arithmetic number, because the mean of its divisors is an integer number (457917007914).

Almost surely, 2^{1221112021102} is an apocalyptic number.

1221112021102 is a deficient number, since it is larger than the sum of its proper divisors (610556010554).

1221112021102 is an equidigital number, since it uses as much as digits as its factorization.

1221112021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610556010553.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221112021102 its reverse (2011202111221), we get a palindrome (3232314132323).

The spelling of 1221112021102 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, twenty-one thousand, one hundred two".