21086265652 has 6 divisors (see below), whose sum is σ = 36900964898. Its totient is φ = 10543132824.

The previous prime is 21086265631. The next prime is 21086265679. The reversal of 21086265652 is 25656268012.

It can be written as a sum of positive squares in only one way, i.e., 19029098916 + 2057166736 = 137946^2 + 45356^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21086265599 and 21086265608.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2635783203 + ... + 2635783210.

Almost surely, 2^21086265652 is an apocalyptic number.

It is an amenable number.

21086265652 is a deficient number, since it is larger than the sum of its proper divisors (15814699246).

21086265652 is a wasteful number, since it uses less digits than its factorization.

21086265652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5271566417 (or 5271566415 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 21086265652 in words is "twenty-one billion, eighty-six million, two hundred sixty-five thousand, six hundred fifty-two".