20247442610621 has 2 divisors, whose sum is σ = 20247442610622. Its totient is φ = 20247442610620.

The previous prime is 20247442610597. The next prime is 20247442610729. The reversal of 20247442610621 is 12601624474202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19858832505625 + 388610104996 = 4456325^2 + 623386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20247442610621 - 2⁶ = 20247442610557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20247442610321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10123721305310 + 10123721305311.

It is an arithmetic number, because the mean of its divisors is an integer number (10123721305311).

Almost surely, 2^{20247442610621} is an apocalyptic number.

It is an amenable number.

20247442610621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20247442610621 is an equidigital number, since it uses as much as digits as its factorization.

20247442610621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 41.

The spelling of 20247442610621 in words is "twenty trillion, two hundred forty-seven billion, four hundred forty-two million, six hundred ten thousand, six hundred twenty-one".