721201222021 has 8 divisors (see below), whose sum is σ = 826404720320. Its totient is φ = 616541411808.

The previous prime is 721201222009. The next prime is 721201222037. The reversal of 721201222021 is 120222102127.

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

It is not a de Polignac number, because 721201222021 - 2⁵ = 721201221989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721201221983 and 721201222001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721201222051) 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, 135919176 + ... + 135924481.

It is an arithmetic number, because the mean of its divisors is an integer number (103300590040).

Almost surely, 2^721201222021 is an apocalyptic number.

It is an amenable number.

721201222021 is a deficient number, since it is larger than the sum of its proper divisors (105203498299).

721201222021 is a wasteful number, since it uses less digits than its factorization.

721201222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271844043.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 721201222021 its reverse (120222102127), we get a palindrome (841423324148).

The spelling of 721201222021 in words is "seven hundred twenty-one billion, two hundred one million, two hundred twenty-two thousand, twenty-one".