105021245561 has 2 divisors, whose sum is σ = 105021245562. Its totient is φ = 105021245560.

The previous prime is 105021245477. The next prime is 105021245611. The reversal of 105021245561 is 165542120501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57285550336 + 47735695225 = 239344^2 + 218485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105021245561 is a prime.

It is a super-2 number, since 2×105021245561² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (105021247561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52510622780 + 52510622781.

It is an arithmetic number, because the mean of its divisors is an integer number (52510622781).

Almost surely, 2^105021245561 is an apocalyptic number.

It is an amenable number.

105021245561 is a deficient number, since it is larger than the sum of its proper divisors (1).

105021245561 is an equidigital number, since it uses as much as digits as its factorization.

105021245561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 105021245561 in words is "one hundred five billion, twenty-one million, two hundred forty-five thousand, five hundred sixty-one".