22721362156249 has 9 divisors (see below), whose sum is σ = 23215310112117. Its totient is φ = 22237709651004.

The previous prime is 22721362156159. The next prime is 22721362156303. The reversal of 22721362156249 is 94265126312722.

The square root of 22721362156249 is 4766693.

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

It is a de Polignac number, because none of the positive numbers 2^k-22721362156249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22721362156196 and 22721362156205.

It is not an unprimeable number, because it can be changed into a prime (22721362156049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 223983862 + ... + 224085280.

Almost surely, 2^{22721362156249} is an apocalyptic number.

22721362156249 is the 4766693-rd square number.

22721362156249 is the 2383347-th centered octagonal number.

It is an amenable number.

22721362156249 is a deficient number, since it is larger than the sum of its proper divisors (493947955868).

22721362156249 is an frugal number, since it uses more digits than its factorization.

22721362156249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202932 (or 101466 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 52.

The spelling of 22721362156249 in words is "twenty-two trillion, seven hundred twenty-one billion, three hundred sixty-two million, one hundred fifty-six thousand, two hundred forty-nine".