3222243993721 has 3 divisors (see below), whose sum is σ = 3222245788783. Its totient is φ = 3222242198660.

The previous prime is 3222243993719. The next prime is 3222243993739. The reversal of 3222243993721 is 1273993422223.

The square root of 3222243993721 is 1795061.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2680224105321 + 542019888400 = 1637139^2 + 736220^2 .

It is not a de Polignac number, because 3222243993721 - 2¹ = 3222243993719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3222243993751) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 897531 + ... + 2692591.

Almost surely, 2^{3222243993721} is an apocalyptic number.

3222243993721 is the 1795061-st square number.

3222243993721 is the 897531-st centered octagonal number.

It is an amenable number.

3222243993721 is a deficient number, since it is larger than the sum of its proper divisors (1795062).

3222243993721 is an frugal number, since it uses more digits than its factorization.

3222243993721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590122 (or 1795061 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 49.

Multiplying 3222243993721 by its sum of digits (49), we get a square (157889955692329 = 12565427²).

The spelling of 3222243993721 in words is "three trillion, two hundred twenty-two billion, two hundred forty-three million, nine hundred ninety-three thousand, seven hundred twenty-one".