101427721 has 2 divisors, whose sum is σ = 101427722. Its totient is φ = 101427720.

The previous prime is 101427679. The next prime is 101427751. The reversal of 101427721 is 127724101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99900025 + 1527696 = 9995^2 + 1236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101427721 is a prime.

It is not a weakly prime, because it can be changed into another prime (101427751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50713860 + 50713861.

It is an arithmetic number, because the mean of its divisors is an integer number (50713861).

Almost surely, 2^101427721 is an apocalyptic number.

It is an amenable number.

101427721 is a deficient number, since it is larger than the sum of its proper divisors (1).

101427721 is an equidigital number, since it uses as much as digits as its factorization.

101427721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 101427721 is about 10071.1330544284. The cubic root of 101427721 is about 466.3574179594.

The spelling of 101427721 in words is "one hundred one million, four hundred twenty-seven thousand, seven hundred twenty-one".