21623545103551 has 48 divisors (see below), whose sum is σ = 23419809927360. Its totient is φ = 19913636160000.

The previous prime is 21623545103507. The next prime is 21623545103591. The reversal of 21623545103551 is 15530154532612.

It is not a de Polignac number, because 21623545103551 - 2⁷ = 21623545103423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21623545103498 and 21623545103507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21623545103591) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28793002426 + ... + 28793003176.

It is an arithmetic number, because the mean of its divisors is an integer number (487912706820).

Almost surely, 2^{21623545103551} is an apocalyptic number.

21623545103551 is a deficient number, since it is larger than the sum of its proper divisors (1796264823809).

21623545103551 is an equidigital number, since it uses as much as digits as its factorization.

21623545103551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 43.

The spelling of 21623545103551 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred forty-five million, one hundred three thousand, five hundred fifty-one".