203121031403 has 2 divisors, whose sum is σ = 203121031404. Its totient is φ = 203121031402.

The previous prime is 203121031397. The next prime is 203121031427. The reversal of 203121031403 is 304130121302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 203121031403 - 2¹⁰ = 203121030379 is a prime.

It is not a weakly prime, because it can be changed into another prime (203121031453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101560515701 + 101560515702.

It is an arithmetic number, because the mean of its divisors is an integer number (101560515702).

Almost surely, 2^203121031403 is an apocalyptic number.

203121031403 is a deficient number, since it is larger than the sum of its proper divisors (1).

203121031403 is an equidigital number, since it uses as much as digits as its factorization.

203121031403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 203121031403 its reverse (304130121302), we get a palindrome (507251152705).

The spelling of 203121031403 in words is "two hundred three billion, one hundred twenty-one million, thirty-one thousand, four hundred three".