21345023324 has 12 divisors (see below), whose sum is σ = 37355052000. Its totient is φ = 10672151328.

The previous prime is 21345023321. The next prime is 21345023327. The reversal of 21345023324 is 42332054312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21345023321) and next prime (21345023327).

It is a super-2 number, since 2×21345023324² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345023321) 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 3 ways as a sum of consecutive naturals, for example, 78077 + ... + 220875.

It is an arithmetic number, because the mean of its divisors is an integer number (3112921000).

Almost surely, 2^21345023324 is an apocalyptic number.

It is an amenable number.

21345023324 is a deficient number, since it is larger than the sum of its proper divisors (16010028676).

21345023324 is a wasteful number, since it uses less digits than its factorization.

21345023324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180172 (or 180170 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 21345023324 its reverse (42332054312), we get a palindrome (63677077636).

The spelling of 21345023324 in words is "twenty-one billion, three hundred forty-five million, twenty-three thousand, three hundred twenty-four".