203121104431220 has 48 divisors (see below), whose sum is σ = 459300762607680. Its totient is φ = 75173034852864.

The previous prime is 203121104431211. The next prime is 203121104431243. The reversal of 203121104431220 is 22134401121302.

It is a happy number.

It is a super-2 number, since 2×203121104431220² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 203121104431220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5062819034 + ... + 5062859153.

It is an arithmetic number, because the mean of its divisors is an integer number (9568765887660).

Almost surely, 2^{203121104431220} is an apocalyptic number.

203121104431220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203121104431220 is an abundant number, since it is smaller than the sum of its proper divisors (256179658176460).

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

203121104431220 is a wasteful number, since it uses less digits than its factorization.

203121104431220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10125678272 (or 10125678270 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 203121104431220 its reverse (22134401121302), we get a palindrome (225255505552522).

The spelling of 203121104431220 in words is "two hundred three trillion, one hundred twenty-one billion, one hundred four million, four hundred thirty-one thousand, two hundred twenty".