1042321221200 has 480 divisors, whose sum is σ = 3055164456960. Its totient is φ = 334197964800.

The previous prime is 1042321221143. The next prime is 1042321221209. The reversal of 1042321221200 is 21221232401.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042321221209) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 362041361 + ... + 362044239.

It is an arithmetic number, because the mean of its divisors is an integer number (6364925952).

Almost surely, 2^{1042321221200} is an apocalyptic number.

1042321221200 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 1042321221200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1527582228480).

1042321221200 is an abundant number, since it is smaller than the sum of its proper divisors (2012843235760).

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

1042321221200 is a wasteful number, since it uses less digits than its factorization.

1042321221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075 (or 3064 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1042321221200 its reverse (21221232401), we get a palindrome (1063542453601).

The spelling of 1042321221200 in words is "one trillion, forty-two billion, three hundred twenty-one million, two hundred twenty-one thousand, two hundred".