721636040352231 has 24 divisors (see below), whose sum is σ = 1042763482051200. Its totient is φ = 480905938737936.

The previous prime is 721636040352211. The next prime is 721636040352259. The reversal of 721636040352231 is 132253040636127.

It is a happy number.

721636040352231 is a `hidden beast` number, since 7 + 2 + 1 + 6 + 3 + 6 + 0 + 403 + 5 + 2 + 231 = 666.

It is not a de Polignac number, because 721636040352231 - 2⁹ = 721636040351719 is a prime.

It is a super-2 number, since 2×721636040352231² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721636040352211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2370819456 + ... + 2371123818.

It is an arithmetic number, because the mean of its divisors is an integer number (43448478418800).

Almost surely, 2^{721636040352231} is an apocalyptic number.

721636040352231 is a deficient number, since it is larger than the sum of its proper divisors (321127441698969).

721636040352231 is a wasteful number, since it uses less digits than its factorization.

721636040352231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404675 (or 404672 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 45.

Adding to 721636040352231 its reverse (132253040636127), we get a palindrome (853889080988358).

The spelling of 721636040352231 in words is "seven hundred twenty-one trillion, six hundred thirty-six billion, forty million, three hundred fifty-two thousand, two hundred thirty-one".