101178045721 has 2 divisors, whose sum is σ = 101178045722. Its totient is φ = 101178045720.

The previous prime is 101178045679. The next prime is 101178045779. The reversal of 101178045721 is 127540871101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74605459600 + 26572586121 = 273140^2 + 163011^2 .

It is a cyclic number.

It is not a de Polignac number, because 101178045721 - 2⁷ = 101178045593 is a prime.

It is not a weakly prime, because it can be changed into another prime (101178046721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50589022860 + 50589022861.

It is an arithmetic number, because the mean of its divisors is an integer number (50589022861).

Almost surely, 2^101178045721 is an apocalyptic number.

It is an amenable number.

101178045721 is a deficient number, since it is larger than the sum of its proper divisors (1).

101178045721 is an equidigital number, since it uses as much as digits as its factorization.

101178045721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 37.

It can be divided in two parts, 1011780 and 45721, that added together give a palindrome (1057501).

The spelling of 101178045721 in words is "one hundred one billion, one hundred seventy-eight million, forty-five thousand, seven hundred twenty-one".