1221121223201 has 8 divisors (see below), whose sum is σ = 1332254175264. Its totient is φ = 1110008593120.

The previous prime is 1221121223191. The next prime is 1221121223207. The reversal of 1221121223201 is 1023221211221.

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 1221121223201 - 2³⁴ = 1203941354017 is a prime.

It is a super-2 number, since 2×1221121223201² (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 (1221121223207) 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, 4954715 + ... + 5195328.

It is an arithmetic number, because the mean of its divisors is an integer number (166531771908).

Almost surely, 2^{1221121223201} is an apocalyptic number.

1221121223201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221121223201 is a deficient number, since it is larger than the sum of its proper divisors (111132952063).

1221121223201 is a wasteful number, since it uses less digits than its factorization.

1221121223201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10160991.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1221121223201 its reverse (1023221211221), we get a palindrome (2244342434422).

The spelling of 1221121223201 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-three thousand, two hundred one".