21223421325 has 36 divisors (see below), whose sum is σ = 40014224640. Its totient is φ = 10723410720.

The previous prime is 21223421321. The next prime is 21223421341. The reversal of 21223421325 is 52312432212.

21223421325 is a `hidden beast` number, since 212 + 2 + 3 + 421 + 3 + 25 = 666.

It is not a de Polignac number, because 21223421325 - 2² = 21223421321 is a prime.

It is a super-2 number, since 2×21223421325² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223421321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2477997 + ... + 2486546.

It is an arithmetic number, because the mean of its divisors is an integer number (1111506240).

Almost surely, 2^21223421325 is an apocalyptic number.

21223421325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21223421325 is a deficient number, since it is larger than the sum of its proper divisors (18790803315).

21223421325 is a wasteful number, since it uses less digits than its factorization.

21223421325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4964578 (or 4964570 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

Adding to 21223421325 its reverse (52312432212), we get a palindrome (73535853537).

The spelling of 21223421325 in words is "twenty-one billion, two hundred twenty-three million, four hundred twenty-one thousand, three hundred twenty-five".