1226821273601 has 32 divisors (see below), whose sum is σ = 1564381900800. Its totient is φ = 953745349200.

The previous prime is 1226821273591. The next prime is 1226821273609. The reversal of 1226821273601 is 1063721286221.

It is not a de Polignac number, because 1226821273601 - 2³⁴ = 1209641404417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1226821273609) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1248950 + ... + 2003376.

It is an arithmetic number, because the mean of its divisors is an integer number (48886934400).

Almost surely, 2^{1226821273601} is an apocalyptic number.

1226821273601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1226821273601 is a deficient number, since it is larger than the sum of its proper divisors (337560627199).

1226821273601 is an equidigital number, since it uses as much as digits as its factorization.

1226821273601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754890 (or 754876 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 1226821273601 in words is "one trillion, two hundred twenty-six billion, eight hundred twenty-one million, two hundred seventy-three thousand, six hundred one".