203421004203091 has 2 divisors, whose sum is σ = 203421004203092. Its totient is φ = 203421004203090.

The previous prime is 203421004203061. The next prime is 203421004203191. The reversal of 203421004203091 is 190302400124302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 203421004203091 - 2¹⁷ = 203421004072019 is a prime.

It is not a weakly prime, because it can be changed into another prime (203421004203061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101710502101545 + 101710502101546.

It is an arithmetic number, because the mean of its divisors is an integer number (101710502101546).

Almost surely, 2^{203421004203091} is an apocalyptic number.

203421004203091 is a deficient number, since it is larger than the sum of its proper divisors (1).

203421004203091 is an equidigital number, since it uses as much as digits as its factorization.

203421004203091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 203421004203091 its reverse (190302400124302), we get a palindrome (393723404327393).

The spelling of 203421004203091 in words is "two hundred three trillion, four hundred twenty-one billion, four million, two hundred three thousand, ninety-one".