203121418640 has 160 divisors (see below), whose sum is σ = 544984118784. Its totient is φ = 68965908480.

The previous prime is 203121418609. The next prime is 203121418649. The reversal of 203121418640 is 46814121302.

It is a super-2 number, since 2×203121418640² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 203121418597 and 203121418606.

It is not an unprimeable number, because it can be changed into a prime (203121418649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25901120 + ... + 25908960.

Almost surely, 2^203121418640 is an apocalyptic number.

203121418640 is a gapful number since it is divisible by the number (20) 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 203121418640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272492059392).

203121418640 is an abundant number, since it is smaller than the sum of its proper divisors (341862700144).

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

203121418640 is a wasteful number, since it uses less digits than its factorization.

203121418640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8305 (or 8299 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

Adding to 203121418640 its reverse (46814121302), we get a palindrome (249935539942).

The spelling of 203121418640 in words is "two hundred three billion, one hundred twenty-one million, four hundred eighteen thousand, six hundred forty".