21745696052 has 12 divisors (see below), whose sum is σ = 39367208580. Its totient is φ = 10497922176.

The previous prime is 21745696051. The next prime is 21745696073. The reversal of 21745696052 is 25069654712.

It can be written as a sum of positive squares in 2 ways, for example, as 3378399376 + 18367296676 = 58124^2 + 135526^2 .

It is a super-4 number, since 4×21745696052⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21745695988 and 21745696006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21745696051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93731333 + ... + 93731564.

It is an arithmetic number, because the mean of its divisors is an integer number (3280600715).

Almost surely, 2^21745696052 is an apocalyptic number.

It is an amenable number.

21745696052 is a deficient number, since it is larger than the sum of its proper divisors (17621512528).

21745696052 is a wasteful number, since it uses less digits than its factorization.

21745696052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187462930 (or 187462928 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 21745696052 in words is "twenty-one billion, seven hundred forty-five million, six hundred ninety-six thousand, fifty-two".