1021203421400 has 48 divisors (see below), whose sum is σ = 2374391072400. Its totient is φ = 408465348480.

The previous prime is 1021203421397. The next prime is 1021203421417. The reversal of 1021203421400 is 41243021201.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5912669 + ... + 6082931.

It is an arithmetic number, because the mean of its divisors is an integer number (49466480675).

Almost surely, 2^{1021203421400} is an apocalyptic number.

1021203421400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021203421400 is an abundant number, since it is smaller than the sum of its proper divisors (1353187651000).

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

1021203421400 is a wasteful number, since it uses less digits than its factorization.

1021203421400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200268 (or 200259 counting only the distinct ones).

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

Adding to 1021203421400 its reverse (41243021201), we get a palindrome (1062446442601).

The spelling of 1021203421400 in words is "one trillion, twenty-one billion, two hundred three million, four hundred twenty-one thousand, four hundred".