20240671445521 has 2 divisors, whose sum is σ = 20240671445522. Its totient is φ = 20240671445520.

The previous prime is 20240671445503. The next prime is 20240671445543. The reversal of 20240671445521 is 12554417604202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11146677304896 + 9093994140625 = 3338664^2 + 3015625^2 .

It is a cyclic number.

It is not a de Polignac number, because 20240671445521 - 2¹⁷ = 20240671314449 is a prime.

It is a super-2 number, since 2×20240671445521² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20240671445221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10120335722760 + 10120335722761.

It is an arithmetic number, because the mean of its divisors is an integer number (10120335722761).

Almost surely, 2^{20240671445521} is an apocalyptic number.

It is an amenable number.

20240671445521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20240671445521 is an equidigital number, since it uses as much as digits as its factorization.

20240671445521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 537600, while the sum is 43.

The spelling of 20240671445521 in words is "twenty trillion, two hundred forty billion, six hundred seventy-one million, four hundred forty-five thousand, five hundred twenty-one".