1221112122001 has 4 divisors (see below), whose sum is σ = 1221114369600. Its totient is φ = 1221109874404.

The previous prime is 1221112121989. The next prime is 1221112122077. The reversal of 1221112122001 is 1002212111221.

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 1221112122001 - 2¹⁵ = 1221112089233 is a prime.

It is a super-2 number, since 2×1221112122001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221112122401) 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, 255180 + ... + 1583458.

It is an arithmetic number, because the mean of its divisors is an integer number (305278592400).

Almost surely, 2^{1221112122001} is an apocalyptic number.

It is an amenable number.

1221112122001 is a deficient number, since it is larger than the sum of its proper divisors (2247599).

1221112122001 is an equidigital number, since it uses as much as digits as its factorization.

1221112122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247598.

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

Adding to 1221112122001 its reverse (1002212111221), we get a palindrome (2223324233222).

The spelling of 1221112122001 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one hundred twenty-two thousand, one".