203121400433981 has 2 divisors, whose sum is σ = 203121400433982. Its totient is φ = 203121400433980.

The previous prime is 203121400433971. The next prime is 203121400434061. The reversal of 203121400433981 is 189334004121302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196883244817081 + 6238155616900 = 14031509^2 + 2497630^2 .

It is a cyclic number.

It is not a de Polignac number, because 203121400433981 - 2¹⁴ = 203121400417597 is a prime.

It is a super-3 number, since 3×203121400433981³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203121400433971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101560700216990 + 101560700216991.

It is an arithmetic number, because the mean of its divisors is an integer number (101560700216991).

Almost surely, 2^{203121400433981} is an apocalyptic number.

It is an amenable number.

203121400433981 is a deficient number, since it is larger than the sum of its proper divisors (1).

203121400433981 is an equidigital number, since it uses as much as digits as its factorization.

203121400433981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 203121400433981 in words is "two hundred three trillion, one hundred twenty-one billion, four hundred million, four hundred thirty-three thousand, nine hundred eighty-one".