21020243881267 has 2 divisors, whose sum is σ = 21020243881268. Its totient is φ = 21020243881266.

The previous prime is 21020243881261. The next prime is 21020243881319. The reversal of 21020243881267 is 76218834202012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020243881267 - 2⁴³ = 12224150859059 is a prime.

It is a super-3 number, since 3×21020243881267³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21020243881261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510121940633 + 10510121940634.

It is an arithmetic number, because the mean of its divisors is an integer number (10510121940634).

Almost surely, 2^{21020243881267} is an apocalyptic number.

21020243881267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020243881267 is an equidigital number, since it uses as much as digits as its factorization.

21020243881267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 21020243881267 in words is "twenty-one trillion, twenty billion, two hundred forty-three million, eight hundred eighty-one thousand, two hundred sixty-seven".