721040127 has 16 divisors (see below), whose sum is σ = 990592512. Its totient is φ = 466175520.

The previous prime is 721040119. The next prime is 721040147.

721040127 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 721040127 - 2³ = 721040119 is a prime.

It is a super-2 number, since 2×721040127² = 1039797729488352258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 721040097 and 721040106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721040147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24078 + ... + 44964.

It is an arithmetic number, because the mean of its divisors is an integer number (61912032).

Almost surely, 2^721040127 is an apocalyptic number.

721040127 is a deficient number, since it is larger than the sum of its proper divisors (269552385).

721040127 is a wasteful number, since it uses less digits than its factorization.

721040127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21238.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 721040127 is about 26852.1903575854. The cubic root of 721040127 is about 896.7123370248.

The spelling of 721040127 in words is "seven hundred twenty-one million, forty thousand, one hundred twenty-seven".