1226821273600 has 576 divisors, whose sum is σ = 3385836417600. Its totient is φ = 438030827520.

The previous prime is 1226821273591. The next prime is 1226821273609. The reversal of 1226821273600 is 63721286221.

It is an interprime number because it is at equal distance from previous prime (1226821273591) and next prime (1226821273609).

It is a Harshad number since it is a multiple of its sum of digits (40).

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 47 ways as a sum of consecutive naturals, for example, 2927974191 + ... + 2927974609.

It is an arithmetic number, because the mean of its divisors is an integer number (5878188225).

Almost surely, 2^{1226821273600} is an apocalyptic number.

1226821273600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1226821273600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1692918208800).

1226821273600 is an abundant number, since it is smaller than the sum of its proper divisors (2159015144000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1226821273600 is a wasteful number, since it uses less digits than its factorization.

1226821273600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 1226821273600 in words is "one trillion, two hundred twenty-six billion, eight hundred twenty-one million, two hundred seventy-three thousand, six hundred".