1221021122101 has 4 divisors (see below), whose sum is σ = 1332023042304. Its totient is φ = 1110019201900.

The previous prime is 1221021122047. The next prime is 1221021122137. The reversal of 1221021122101 is 1012211201221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221021122101 - 2⁹ = 1221021121589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221021122161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55500960085 + ... + 55500960106.

It is an arithmetic number, because the mean of its divisors is an integer number (333005760576).

Almost surely, 2^{1221021122101} is an apocalyptic number.

1221021122101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221021122101 is a deficient number, since it is larger than the sum of its proper divisors (111001920203).

1221021122101 is a wasteful number, since it uses less digits than its factorization.

1221021122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111001920202.

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

Adding to 1221021122101 its reverse (1012211201221), we get a palindrome (2233232323322).

The spelling of 1221021122101 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred twenty-two thousand, one hundred one".