1221222122101 has 8 divisors (see below), whose sum is σ = 1224430695000. Its totient is φ = 1218014361600.

The previous prime is 1221222122077. The next prime is 1221222122117. The reversal of 1221222122101 is 1012212221221.

It can be written as a sum of positive squares in 4 ways, for example, as 115464719601 + 1105757402500 = 339801^2 + 1051550^2 .

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 1221222122101 - 2¹⁷ = 1221221991029 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 (1221222162101) 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, 2868175 + ... + 3266323.

It is an arithmetic number, because the mean of its divisors is an integer number (153053836875).

Almost surely, 2^{1221222122101} is an apocalyptic number.

It is an amenable number.

1221222122101 is a deficient number, since it is larger than the sum of its proper divisors (3208572899).

1221222122101 is an equidigital number, since it uses as much as digits as its factorization.

1221222122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406199.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221222122101 its reverse (1012212221221), we get a palindrome (2233434343322).

The spelling of 1221222122101 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred one".