721061001121 has 4 divisors (see below), whose sum is σ = 721485406000. Its totient is φ = 720636596244.

The previous prime is 721061001047. The next prime is 721061001139. The reversal of 721061001121 is 121100160127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721061001121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721061001092 and 721061001101.

It is not an unprimeable number, because it can be changed into a prime (721061001161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212199891 + ... + 212203288.

It is an arithmetic number, because the mean of its divisors is an integer number (180371351500).

Almost surely, 2^721061001121 is an apocalyptic number.

It is an amenable number.

721061001121 is a deficient number, since it is larger than the sum of its proper divisors (424404879).

721061001121 is a wasteful number, since it uses less digits than its factorization.

721061001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424404878.

The product of its (nonzero) digits is 168, while the sum is 22.

Adding to 721061001121 its reverse (121100160127), we get a palindrome (842161161248).

The spelling of 721061001121 in words is "seven hundred twenty-one billion, sixty-one million, one thousand, one hundred twenty-one".