721242127 has 2 divisors, whose sum is σ = 721242128. Its totient is φ = 721242126.

The previous prime is 721242121. The next prime is 721242173.

721242127 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721242127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721242095 and 721242104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721242121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360621063 + 360621064.

It is an arithmetic number, because the mean of its divisors is an integer number (360621064).

Almost surely, 2^721242127 is an apocalyptic number.

721242127 is a deficient number, since it is larger than the sum of its proper divisors (1).

721242127 is an equidigital number, since it uses as much as digits as its factorization.

721242127 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3136, while the sum is 28.

The square root of 721242127 is about 26855.9514260806. The cubic root of 721242127 is about 896.7960674455.

The spelling of 721242127 in words is "seven hundred twenty-one million, two hundred forty-two thousand, one hundred twenty-seven".