21652623456503 has 12 divisors (see below), whose sum is σ = 23500480560480. Its totient is φ = 19940877530496.

The previous prime is 21652623456439. The next prime is 21652623456533. The reversal of 21652623456503 is 30565432625612.

It is a happy number.

It is not a de Polignac number, because 21652623456503 - 2⁶ = 21652623456439 is a prime.

It is a super-2 number, since 2×21652623456503² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21652623456533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147873743 + ... + 148020096.

It is an arithmetic number, because the mean of its divisors is an integer number (1958373380040).

Almost surely, 2^{21652623456503} is an apocalyptic number.

21652623456503 is a deficient number, since it is larger than the sum of its proper divisors (1847857103977).

21652623456503 is a wasteful number, since it uses less digits than its factorization.

21652623456503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295894298 (or 295894285 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 50.

The spelling of 21652623456503 in words is "twenty-one trillion, six hundred fifty-two billion, six hundred twenty-three million, four hundred fifty-six thousand, five hundred three".