721120021211 has 8 divisors (see below), whose sum is σ = 740623788144. Its totient is φ = 701616993120.

The previous prime is 721120021201. The next prime is 721120021217. The reversal of 721120021211 is 112120021127.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721120021211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721120021217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2206796 + ... + 2512406.

It is an arithmetic number, because the mean of its divisors is an integer number (92577973518).

Almost surely, 2^721120021211 is an apocalyptic number.

721120021211 is a deficient number, since it is larger than the sum of its proper divisors (19503766933).

721120021211 is a wasteful number, since it uses less digits than its factorization.

721120021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369421.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 721120021211 its reverse (112120021127), we get a palindrome (833240042338).

The spelling of 721120021211 in words is "seven hundred twenty-one billion, one hundred twenty million, twenty-one thousand, two hundred eleven".