721123021222 has 4 divisors (see below), whose sum is σ = 1081684531836. Its totient is φ = 360561510610.

The previous prime is 721123021207. The next prime is 721123021231. The reversal of 721123021222 is 222120321127.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180280755304 + ... + 180280755307.

It is an arithmetic number, because the mean of its divisors is an integer number (270421132959).

Almost surely, 2^721123021222 is an apocalyptic number.

721123021222 is a deficient number, since it is larger than the sum of its proper divisors (360561510614).

721123021222 is a wasteful number, since it uses less digits than its factorization.

721123021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360561510613.

The product of its (nonzero) digits is 1344, while the sum is 25.

Adding to 721123021222 its reverse (222120321127), we get a palindrome (943243342349).

The spelling of 721123021222 in words is "seven hundred twenty-one billion, one hundred twenty-three million, twenty-one thousand, two hundred twenty-two".