203121344220040 has 32 divisors (see below), whose sum is σ = 458919385614360. Its totient is φ = 80911406822400.

The previous prime is 203121344220007. The next prime is 203121344220101. The reversal of 203121344220040 is 40022443121302.

It can be written as a sum of positive squares in 4 ways, for example, as 187348039500196 + 15773304719844 = 13687514^2 + 3971562^2 .

It is a junction number, because it is equal to n+sod(n) for n = 203121344219990 and 203121344220008.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10535329791 + ... + 10535349070.

Almost surely, 2^{203121344220040} is an apocalyptic number.

203121344220040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203121344220040 is an abundant number, since it is smaller than the sum of its proper divisors (255798041394320).

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

203121344220040 is a wasteful number, since it uses less digits than its factorization.

203121344220040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21070679113 (or 21070679109 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 203121344220040 its reverse (40022443121302), we get a palindrome (243143787341342).

The spelling of 203121344220040 in words is "two hundred three trillion, one hundred twenty-one billion, three hundred forty-four million, two hundred twenty thousand, forty".