21223244425 has 6 divisors (see below), whose sum is σ = 26316823118. Its totient is φ = 16978595520.

The previous prime is 21223244417. The next prime is 21223244429. The reversal of 21223244425 is 52444232212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3539298064 + 17683946361 = 59492^2 + 132981^2 .

It is not a de Polignac number, because 21223244425 - 2³ = 21223244417 is a prime.

It is a super-3 number, since 3×21223244425³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223244429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 424464864 + ... + 424464913.

Almost surely, 2^21223244425 is an apocalyptic number.

21223244425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21223244425 is a deficient number, since it is larger than the sum of its proper divisors (5093578693).

21223244425 is an equidigital number, since it uses as much as digits as its factorization.

21223244425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848929787 (or 848929782 counting only the distinct ones).

The product of its digits is 30720, while the sum is 31.

Adding to 21223244425 its reverse (52444232212), we get a palindrome (73667476637).

The spelling of 21223244425 in words is "twenty-one billion, two hundred twenty-three million, two hundred forty-four thousand, four hundred twenty-five".