21323220325 has 24 divisors (see below), whose sum is σ = 28891784736. Its totient is φ = 15482376000.

The previous prime is 21323220323. The next prime is 21323220341. The reversal of 21323220325 is 52302232312.

It is not a de Polignac number, because 21323220325 - 2¹ = 21323220323 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21323220325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323220323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105330 + ... + 231820.

It is an arithmetic number, because the mean of its divisors is an integer number (1203824364).

Almost surely, 2^21323220325 is an apocalyptic number.

21323220325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21323220325 is a deficient number, since it is larger than the sum of its proper divisors (7568564411).

21323220325 is a wasteful number, since it uses less digits than its factorization.

21323220325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127125 (or 127120 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 21323220325 its reverse (52302232312), we get a palindrome (73625452637).

The spelling of 21323220325 in words is "twenty-one billion, three hundred twenty-three million, two hundred twenty thousand, three hundred twenty-five".