1221101021121 has 8 divisors (see below), whose sum is σ = 1631894822880. Its totient is φ = 812187283392.

The previous prime is 1221101021051. The next prime is 1221101021123. The reversal of 1221101021121 is 1211201011221.

It is a happy number.

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

It is not a de Polignac number, because 1221101021121 - 2¹⁷ = 1221100890049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221101021121.

It is not an unprimeable number, because it can be changed into a prime (1221101021123) 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, 470014491 + ... + 470017088.

It is an arithmetic number, because the mean of its divisors is an integer number (203986852860).

Almost surely, 2^{1221101021121} is an apocalyptic number.

It is an amenable number.

1221101021121 is a deficient number, since it is larger than the sum of its proper divisors (410793801759).

1221101021121 is an equidigital number, since it uses as much as digits as its factorization.

1221101021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940032015.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221101021121 its reverse (1211201011221), we get a palindrome (2432302032342).

The spelling of 1221101021121 in words is "one trillion, two hundred twenty-one billion, one hundred one million, twenty-one thousand, one hundred twenty-one".