266421021400 has 96 divisors (see below), whose sum is σ = 624960446400. Its totient is φ = 105620889600.

The previous prime is 266421021397. The next prime is 266421021421. The reversal of 266421021400 is 4120124662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10447866 + ... + 10473334.

It is an arithmetic number, because the mean of its divisors is an integer number (6510004650).

Almost surely, 2^266421021400 is an apocalyptic number.

266421021400 is a gapful number since it is divisible by the number (20) 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 266421021400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312480223200).

266421021400 is an abundant number, since it is smaller than the sum of its proper divisors (358539425000).

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

266421021400 is a wasteful number, since it uses less digits than its factorization.

266421021400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25949 (or 25940 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The spelling of 266421021400 in words is "two hundred sixty-six billion, four hundred twenty-one million, twenty-one thousand, four hundred".