21944444153 has 2 divisors, whose sum is σ = 21944444154. Its totient is φ = 21944444152.

The previous prime is 21944444107. The next prime is 21944444167. The reversal of 21944444153 is 35144444912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21938645689 + 5798464 = 148117^2 + 2408^2 .

It is a cyclic number.

It is not a de Polignac number, because 21944444153 - 2⁶ = 21944444089 is a prime.

It is a super-3 number, since 3×21944444153³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21944444153.

It is not a weakly prime, because it can be changed into another prime (21944444183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10972222076 + 10972222077.

It is an arithmetic number, because the mean of its divisors is an integer number (10972222077).

Almost surely, 2^21944444153 is an apocalyptic number.

It is an amenable number.

21944444153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21944444153 is an equidigital number, since it uses as much as digits as its factorization.

21944444153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 41.

The spelling of 21944444153 in words is "twenty-one billion, nine hundred forty-four million, four hundred forty-four thousand, one hundred fifty-three".