101266721 has 2 divisors, whose sum is σ = 101266722. Its totient is φ = 101266720.

The previous prime is 101266691. The next prime is 101266757. The reversal of 101266721 is 127662101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94789696 + 6477025 = 9736^2 + 2545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101266721 is a prime.

It is not a weakly prime, because it can be changed into another prime (101266021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50633360 + 50633361.

It is an arithmetic number, because the mean of its divisors is an integer number (50633361).

Almost surely, 2^101266721 is an apocalyptic number.

It is an amenable number.

101266721 is a deficient number, since it is larger than the sum of its proper divisors (1).

101266721 is an equidigital number, since it uses as much as digits as its factorization.

101266721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 101266721 is about 10063.1367376181. The cubic root of 101266721 is about 466.1105317819.

The spelling of 101266721 in words is "one hundred one million, two hundred sixty-six thousand, seven hundred twenty-one".