20021201001943 has 2 divisors, whose sum is σ = 20021201001944. Its totient is φ = 20021201001942.

The previous prime is 20021201001929. The next prime is 20021201001979. The reversal of 20021201001943 is 34910010212002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021201001943 - 2²⁹ = 20020664131031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021201001343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010600500971 + 10010600500972.

It is an arithmetic number, because the mean of its divisors is an integer number (10010600500972).

Almost surely, 2^{20021201001943} is an apocalyptic number.

20021201001943 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021201001943 is an equidigital number, since it uses as much as digits as its factorization.

20021201001943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 20021201001943 its reverse (34910010212002), we get a palindrome (54931211213945).

The spelling of 20021201001943 in words is "twenty trillion, twenty-one billion, two hundred one million, one thousand, nine hundred forty-three".