203154221040 has 80 divisors (see below), whose sum is σ = 630216806400. Its totient is φ = 54136719616.

The previous prime is 203154221009. The next prime is 203154221057. The reversal of 203154221040 is 40122451302.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 203154221040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51241 + ... + 639479.

It is an arithmetic number, because the mean of its divisors is an integer number (7877710080).

Almost surely, 2^203154221040 is an apocalyptic number.

203154221040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203154221040 is an abundant number, since it is smaller than the sum of its proper divisors (427062585360).

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

203154221040 is a wasteful number, since it uses less digits than its factorization.

203154221040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589694 (or 589688 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 203154221040 its reverse (40122451302), we get a palindrome (243276672342).

The spelling of 203154221040 in words is "two hundred three billion, one hundred fifty-four million, two hundred twenty-one thousand, forty".