1221120221101 has 8 divisors (see below), whose sum is σ = 1335221947008. Its totient is φ = 1107533628000.

The previous prime is 1221120221059. The next prime is 1221120221221. The reversal of 1221120221101 is 1011220211221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221120221101 - 2¹³ = 1221120212909 is a prime.

It is a super-2 number, since 2×1221120221101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221120221401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128778240 + ... + 128787721.

It is an arithmetic number, because the mean of its divisors is an integer number (166902743376).

Almost surely, 2^{1221120221101} is an apocalyptic number.

1221120221101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221120221101 is a deficient number, since it is larger than the sum of its proper divisors (114101725907).

1221120221101 is a wasteful number, since it uses less digits than its factorization.

1221120221101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257566403.

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

Adding to 1221120221101 its reverse (1011220211221), we get a palindrome (2232340432322).

The spelling of 1221120221101 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred twenty-one thousand, one hundred one".