21021031330043 has 2 divisors, whose sum is σ = 21021031330044. Its totient is φ = 21021031330042.

The previous prime is 21021031329971. The next prime is 21021031330073. The reversal of 21021031330043 is 34003313012012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21021031330043 - 2²⁰ = 21021030281467 is a prime.

It is not a weakly prime, because it can be changed into another prime (21021031330073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510515665021 + 10510515665022.

It is an arithmetic number, because the mean of its divisors is an integer number (10510515665022).

Almost surely, 2^{21021031330043} is an apocalyptic number.

21021031330043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021031330043 is an equidigital number, since it uses as much as digits as its factorization.

21021031330043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21021031330043 its reverse (34003313012012), we get a palindrome (55024344342055).

The spelling of 21021031330043 in words is "twenty-one trillion, twenty-one billion, thirty-one million, three hundred thirty thousand, forty-three".