721011110100001 has 16 divisors (see below), whose sum is σ = 824539735296000. Its totient is φ = 617614330556880.

The previous prime is 721011110099927. The next prime is 721011110100007. The reversal of 721011110100001 is 100001011110127.

It is a cyclic number.

It is not a de Polignac number, because 721011110100001 - 2¹¹ = 721011110097953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721011110100007) 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, 96982986 + ... + 104152396.

It is an arithmetic number, because the mean of its divisors is an integer number (51533733456000).

Almost surely, 2^{721011110100001} is an apocalyptic number.

It is an amenable number.

721011110100001 is a deficient number, since it is larger than the sum of its proper divisors (103528625195999).

721011110100001 is a wasteful number, since it uses less digits than its factorization.

721011110100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7178604.

The product of its (nonzero) digits is 14, while the sum is 16.

Adding to 721011110100001 its reverse (100001011110127), we get a palindrome (821012121210128).

The spelling of 721011110100001 in words is "seven hundred twenty-one trillion, eleven billion, one hundred ten million, one hundred thousand, one".