21001102020043 has 2 divisors, whose sum is σ = 21001102020044. Its totient is φ = 21001102020042.

The previous prime is 21001102019977. The next prime is 21001102020047. The reversal of 21001102020043 is 34002020110012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001102020043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001102019999 and 21001102020026.

It is not a weakly prime, because it can be changed into another prime (21001102020047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500551010021 + 10500551010022.

It is an arithmetic number, because the mean of its divisors is an integer number (10500551010022).

Almost surely, 2^{21001102020043} is an apocalyptic number.

21001102020043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001102020043 is an equidigital number, since it uses as much as digits as its factorization.

21001102020043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21001102020043 its reverse (34002020110012), we get a palindrome (55003122130055).

The spelling of 21001102020043 in words is "twenty-one trillion, one billion, one hundred two million, twenty thousand, forty-three".