20243242336621 has 2 divisors, whose sum is σ = 20243242336622. Its totient is φ = 20243242336620.

The previous prime is 20243242336607. The next prime is 20243242336633. The reversal of 20243242336621 is 12663324234202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20122356782025 + 120885554596 = 4485795^2 + 347686^2 .

It is a cyclic number.

It is not a de Polignac number, because 20243242336621 - 2¹⁵ = 20243242303853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20243242336601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10121621168310 + 10121621168311.

It is an arithmetic number, because the mean of its divisors is an integer number (10121621168311).

Almost surely, 2^{20243242336621} is an apocalyptic number.

It is an amenable number.

20243242336621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20243242336621 is an equidigital number, since it uses as much as digits as its factorization.

20243242336621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 40.

The spelling of 20243242336621 in words is "twenty trillion, two hundred forty-three billion, two hundred forty-two million, three hundred thirty-six thousand, six hundred twenty-one".