203231221400 has 48 divisors (see below), whose sum is σ = 472609658040. Its totient is φ = 81275788800.

The previous prime is 203231221351. The next prime is 203231221429. The reversal of 203231221400 is 4122132302.

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, 895520 + ... + 1099280.

Almost surely, 2^203231221400 is an apocalyptic number.

203231221400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203231221400 is an abundant number, since it is smaller than the sum of its proper divisors (269378436640).

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

203231221400 is a wasteful number, since it uses less digits than its factorization.

203231221400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208764 (or 208755 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 203231221400 its reverse (4122132302), we get a palindrome (207353353702).

The spelling of 203231221400 in words is "two hundred three billion, two hundred thirty-one million, two hundred twenty-one thousand, four hundred".