21320023445 has 16 divisors (see below), whose sum is σ = 29270749440. Its totient is φ = 14603514624.

The previous prime is 21320023427. The next prime is 21320023453. The reversal of 21320023445 is 54432002312.

It is a cyclic number.

It is not a de Polignac number, because 21320023445 - 2⁶ = 21320023381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299252 + ... + 363581.

It is an arithmetic number, because the mean of its divisors is an integer number (1829421840).

Almost surely, 2^21320023445 is an apocalyptic number.

It is an amenable number.

21320023445 is a deficient number, since it is larger than the sum of its proper divisors (7950725995).

21320023445 is an equidigital number, since it uses as much as digits as its factorization.

21320023445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663764.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 21320023445 its reverse (54432002312), we get a palindrome (75752025757).

The spelling of 21320023445 in words is "twenty-one billion, three hundred twenty million, twenty-three thousand, four hundred forty-five".